Controlling Sky Color in Star Circle Images During the New Moon

This image was created using a technique I call time stacking. It is similar to taking a time lapse video over the course of a night, but instead of sequentially displaying each frame in a short animated video, I take the best parts from each exposure, and combine them in Photoshop using layers and masks to create the final image that is pleasing to my eye. It is a topic worthy of a separate post, which I shall write soon, but this post is about one small step in the process, in which I deliberately created the look of the sky you see in the image above during a new moon phase.


Original Star Circles Taken During Dark Sky

So here is the problem I was trying to solve (I have masked out the foreground for the purposes of this post, this is about the sky only).  The star circle layers I wanted to use consisted of 5 consecutive exposures, each @4min/f4.0/ISO400, taken during astronomical darkness. When the Blending Mode of these 5 layers are set to Lighten, you end up with a very dark, almost black sky. I like the way my chosen exposure settings rendered the star circles – bright, colorful, and at the density and intensity I find appealing, but I do not care for a black sky. How to lighten the sky? That is the question.


Sky Exposure Taken During Blue Hour

Here is one technique that I turn to often to control the color of the sky when I set out to create star circle images. Remember, I am essentially recording data to be put together in a final image later on, so as part of the process, I make sure to capture a sequence of exposures during the entire blue hour, just up until the time when stars become visible. So the series of exposures I have to choose from range from very light blue, to very dark blue. I just pick the one exposure that I like best, and include it in my image as a separate layer. as you can see in the screen capture above.


                      Blue Hour Sky Blended With Dark Sky Star Circles 
Now, if I set the Blending Mode of this new “blue hour” layer to Screen, you’ll see that the star circles remain nearly unchanged, but the color of the sky is now the “blue hour”color, as shown in the screen capture above.


Composite Sky Darkened By Reducing Opacity Of Blue Sky Layer

I like to select a “blue hour” sky exposure that is a bit lighter than what I envision for the final image. By doing this, I can dynamically change the lightness of the sky simply by changing the Opacity amount for the “blue hour” layer. In this case, I thought 40% Opacity looked the best.

So there you have it. Another tool in the arsenal of techniques at your disposal for controlling the look of your star circle images. Give it a whirl

My Night Photography Light Kit

One aspect of night photography that I really enjoy is the use of added light to achieve some desired outcome. One thing I have discovered is that if you get bitten by the night-lighting bug, the result is usually Gear Acquisition Syndrome, in which every type of light source becomes an object of desire. I will attempt to show you how it has affected me, in this round-the-kitchen-table style post regarding my light kit.


Utility Working Lights

Key Chain LED Light

I’ll start with my most used and cherished light. That’s right, this tiny key chain light. You probably have one sitting in your kitchen junk drawer (everybody has a junk drawer, right?). And why is this my favorite light?

Well, my friends, I am about to tell you a hard truth, something your best friend might hesitate to tell you for fear of hurting your feelings. Do not be “that guy” (to my friends of the female persuasion, feel free to substitute “that gal”). You know who I’m talking about - “that guy” who approaches you with a question and has his headlamp shining right into your eyes, “that guy” who fishes a 2000 lumen flashlight from his bag and lights up the entire county in order to change a setting on his camera, “that guy” who has read an astronomy magazine article about how red light preserves night vision, so now all of your images have his red light bleeding into all of your images (see this article on the Night Photography Workshop blog about the evil of red lights). “That guy” never gets invited to go shooting with others again. So don’t be “that guy”.

I have two of these small, inexpensive key chain lights attached to a lanyard that goes around my neck as soon as I start setting up my gear for the night. One is wrapped with gaffers tape to dim the light to a small, focused beam. It is perfect for adjusting settings or looking at degree markings on a panoramic head. Just bright enough to read markings, but dim enough that it does not bother other photographers around you. The second, unwrapped and brighter LED key chain light, is great for looking through your camera bag or checking your surroundings, again, without bothering others.

It is amazing how little light you really need to accomplish your night photography tasks, once you become familiar with handling and adjusting your equipment in the dark.

These little lights are so cheap that I buy them in bulk, and pass them around freely whenever I am shooting at night with others. It saves a lot of hard feelings, as well as images. Hopefully, I will have prevented someone from inadvertently becoming “that guy”.

LED Head Lamp

The next light that I always have with me on a night shoot is my headlamp. When I am shooting by myself I use my headlamp freely, however when shooting along with others, I rarely use my headlamp outside of hiking from my vehicle to the shooting locale and back.

I use the Nitecore HC90 headlamp shown above. This headlamp has many important features that I have grown accustomed to. It has a maximum brightness of 900 lumens, which can be very handy when negotiating trails at night, or other times when you absolutely must have a bright light at hand. But what I like the most about this headlamp is that it can be turned on to its least powerful setting, .2 lumens (that’s right, POINT 2 lumens) instantly and conveniently, so you can use this headlamp in a responsible manner, and not blind your shooting partners. The headlamp is rugged and heavily built, and operates with a single 18650 lithium battery. It is rechargeable either by removing the battery and placing it in a separate charger, or by plugging it directly into a USB charging source. In addition to the variable intensity white light, this headlamp includes red, blue, and green LEDs, which are activated by the sliding switch. I rarely have reason to use the RGB LEDs, so I generally cover the LED’s with gaffers tape so I don’t accidentally turn them on (and become “that guy”).


High Intensity White Lights For Light Painting



Small 460 Lumen All Purpose LED Flashlight

There are times when a key chain light or a headlamp will not provide the light you need for light painting a scene. For this you need other tools (although a headlamp can sometimes be used in a pinch). My smallest, least powerful hand-held flashlight is the Nitecore EC21 shown above. It has a maximum brightness of 460 lumens, but still dims to 1 lumen, and has a built-in red LED. It is powered by a single 18650 lithium battery. When the power is locked off, the flashlight indicates the remaining battery capacity. It is simple to turn the light on and off, but there is no momentary on, just a toggle for on/off. For some light painters, this is an issue. I have other flashlights with momentary on when I need that feature, so it is not important for me that this particular flashlight lacks this ability.

Mid-size 2000 Lumen Bright LED Flashlight

Next up is a hand-held flashlight that I love for various reasons. Pictured above is the Nitecore P36, a workhorse that is a tool I reach for often. It has a maximum brightness of a blinding 2000 lumens, very useful when you are deep in the woods some night and you are sure you just heard Bigfoot rustling in the nearby trees! And yet, with amazing speed and simplicity, it dims down to 2 lumens, with a total of 10 steps of adjustment. It is equipped with a dual on-off switch. It will toggle on and off, or function as a momentary on button. It is a simple and intuitive design. Because of the high power this light is capable of producing, it is important to pair it with sufficient energy. This flashlight is powered by 2 x 18650 lithium batteries, to provide ample power for many nights of photography without having to recharge.

P36 LED Flashlight With Snoot

This is the same Nitecore P36, but fitted with a home-fashioned snoot. A snoot is useful to narrow the beam of a light source. I have made snoots of various lengths for each of my lights. and choose which to use based on the needs of each different scene.

It is useful to bring up the issue of color temperature at this point. The three Nitecore lights I have shown you are each equipped with a different type of LED bulb, ranging from very cool to very warm.

The image above clearly illustrates the color temperature difference between the various CREE LED bulbs. Notice that the Nitecore P36 flashlight, equipped with the warm CREE MT-G2 is my workhorse light for lightpainting. This is one reason why. For more on this topic, see my post entitled “All LED Bulbs Are NOT Created Equal”.

Here are some examples of images made using light painting techniques with these Nitecore lights:

High Contrast Texture Added To Foreground

Here the exposure was set to capture star circles with the full moon illuminating the terrain, balanced with the P36 set to low brightness to illuminate the wheel, then quickly set to high brightness to provide high contrast lighting to the sagebrush. So there are actually three light sources here – the moon, the P36 at low intensity, and the P36 at high intensity. All in a single exposure.

High Contrast Texture Added To Foreground

The Nitecore P36 was used in this image in a similar way. This is a single exposure, with the P36 used at first in its lowest setting to paint the stone wall, and then quickly switched to high brightness to accentuate the sagebrush. The length of the exposure was limited by the desire to create pinpoint stars.


High Intensity Colored LED Flashlight For Light Painting

ProtoMachine LED2

This is the ProtoMachine LED2. It is a tool developed specifically for the purpose of light painting. It is being marketed in its current configuration as the ProtoMachine LED8, similar in most functionality, but with a few updated controls. This light can be set to produce the entire HSL light wheel, and allows for eight user customizable presets, so you can quickly recall pre-selected colors at will.

ProtoMachine LED2 Control Panel

The control panel on the back of the ProtoMachine LED2 light, showing the buttons and joystick used to set the desired lighting.

ProtoMachine LED2 With Snoot

The ProtoMachine LED2 fitted with one of my home brewed snoots. I have created snoots of various lengths for all of my lights, and use the length necessary for the task at hand with each shoot.

Here are some examples using the ProtoMachine LED2 to add color to an image:

Lake Painted Blue with ProtoMachine LED2

I was quite surprised to see that the color of Table Rock Lake turned a brilliant shade of blue by illuminating the water with the ProtoMachine LED2 set to a nice shade of blue for about 2 minutes.

Big Bridge Over Cricket Creek

This is a good example to show the distance the ProtoMachine LED2 will throw a beam of light. The underside of these Highway 65 bridge spans were painted with the LED2 set to about 70% output

Painting Color On A White Automobile

.An image showing the addition of color from painting a white SUV with various shades of reds and blues from the ProtoMachine LED2.

The Tractor From Hades

I wanted to achieve a “tractor from Hell” look to this image, so I used various shades of orange from the ProtoMachine LED2 to light paint the tractor.


Low Level Lighting


Low-Level Lighting (LLL), sometimes referred to as Low-Level Landscape Lighting (LLLL) is a method of lighting the foreground elements of an image through the use of a very dim light source kept on for the duration of the exposure. The light level is adjusted to the same intensity level as the stars or Milky Way, thus ensuring that an exposure that works for the sky will also work for the foreground. Once the lighting levels have been properly balanced, the low-level lights can remain on without further adjustment for the duration of the shoot. It makes simple work of ensuring consistent lighting in exposures for work requiring multiple captures to produce the final image.

I should note that Low Level Lighting also includes moonlight! The moon is the most wonderful tool available to the night photographer. It is such an important aspect to night photography generally, and astro-landscape photography in particular, that I shall offer my thoughts in a separate post. For now, I’ll just talk about artificial light sources.

F&V Z96 Warming, Milk White, and Diffusion Filters

I have been using three of these F&V Z96 Light Panels for about 2 years, and find myself using them regularly. This LED light panel consists of 96 LED bulbs that allow for brightness adjustment via a dial on the rear of the body.

The light comes with 2 filters – a warming filter and a diffusing filter. I have found a third filter, the F&V Milk White Diffusion Filter on Amazon. I have found that I rarely have to turn the light intensity up beyond the absolute minimum in order to get properly balanced lighting. In fact, I usually have to dim the light further, and find the Milk White filter reduces the light output considerably. This can be a real convenience when it is difficult to move the lights further from the subject, and they are already turned down to their dimmest setting.

F&V Z96 powered by NP-F970 Li-ion battery

There are three ways to power this light. I use a NP-F970 Li-ion battery, which will last for several nights without needing to be recharged. The downside is the size and weight of the battery. Alternatively, the light can be operated with AA alkaline batteries instead.

F&V Z96 powered by (5) AA alkaline batteries

There is also a receptacle for a 12v power supply, which I never use.

F&V Z96 rigged with a lower barn door shade

The F&V Z96 LED light panels tend to spill a lot of light downward, which may sometimes interfere with the intended shot. I this case, I have found that improvising a barn-door shade that fits between the LED Panel body and tripod/light stand works wonders. It is light, easy to fabricate, and packs easily.

Manfrotto Tripods and Joby GorillaPods

I use Joby GorillaPods and Manfrotto compact tripods as light stands for my LED light panels, as well as my Yongnuo Electronic Flash units (more on these later in this post). I have been asked why I carry three LED light panels, as well as light stands around. Do I really need all three? Here are some examples where three lights came in handy.

One panel for left-front, one for right-side, and one for second structure

Here is a shot that required three exterior lights. One was set up to illuminate the left hand side of the church, including the doorway. A second panel was set up to illuminate the side of the church, while a third light was set up to illuminate the schoolhouse structure in the background.

Three Z96 LED panels spread out to illuminate the tree line

In this image there would have been no easy way to illuminate the entire line of trees down the length of this highway without the help of three LED light panels (I know that one could take a single LED panel and walk up and down the roadway shining the LED panel up at the trees, and do this repeatedly for a long time, hoping to not get run over in the process, but PLEASE – I’m an old(ish) man!!

I could include other examples, but the point is, more light panels mean more opportunities. And while not absolutely necessary, they can be helpful when contemplating a night composition.


Other Fun Lighting Gear


The Pixelstick

The Pixelstick is a digital light painting tool that has several modes of operation, and allows the photographer to express their artistic sensibilities in various ways. I have only owned a Pixelstick for a short time, so I do not have a great amount of experience with it, other than the basics that I have experimented with to date. At first glance, however, I can see that this is going to be a lot of fun, as well as challenging my creativity.

Pixelstick in storage case (shown broken down for transport)

Pixelstick Controller Module

The controller assemble of the Pixelstick is the brains behind this device. It accepts SD cards to store bit mapped image files, which it then projects on its integral LED bulbs. The menu system built into firmware allows the parameters of the current project to be programmed and stored.

The Pixelstick is taller than I am when it is completely assembled. It is a light painting tool that consists of 200 LED bulbs, with each bulb independently addressable and capable of producing the color spectrum at a variety of intensities. It can effectively project an image consisting of vertical pixels, that when transported across the field of view, creates an image. Although I have not used the Pixelstick extensively, I have a few examples to show what a few of its capabilities are.

Front lawn on fire

In this image, I used a stock bit map image of flames to create this scene. I set the Repeat mode on and proceeded to walk around my yard and up and down the road in front of the house to create an illusion of flames. This was all done while the camera shutter was open for a long exposure.

South Moulton Barn in the Ozarks

In this image, I took a photograph of the South Moulton Barn, which is located in Grand Teton National Park in Wyoming, and uploaded it as a bit map image to my Pixelstick. By walking across my front lawn while projecting this barn image from the Pixelstick, I was able to create the illusion of the barn being in the Ozarks. The waviness exhibited in the barn is due to my lack of practice in developing a smooth, gliding gait while carrying the Pixelstick. Practice should remedy this shortcoming in the future.

And finally, here is my attempt to place an armadillo in my campsite while on a trip to Kansas. All in all, I am looking forward to seeing what I can come up with using the Pixelstick over the next year or so. I fear the capabilities of the Pixelstick will greatly surpass my creative imagination. We’ll see.

Multi-function mini lanterns

These inexpensive mini lanterns have proven to be very useful in many situations. They are small, readily available, and cheap. Here are a couple of examples of the mini lanterns in use:

Mini lanterns simulate glowing embers

When I went to the Cricket Creek Public Use Area last year to shoot some night sky photographs, the Army Corp of Engineers had bulldozed some driftwood into a big pile on the beach right where I planned to set up my tripod. Rather than fret, I set up three of my mini-lanterns in the pile of driftwood, and turned them on to the red mode. It simulated the look of embers glowing from a fire, and created some interest in the foreground that otherwise would have been plain and barren.

Mini lantern illuminating cemetery monument recess

A single mini lantern was used to illuminate the recess in the cemetery monument located at the entrance to the Terlingua Cemetery in Texas.

Mini lanterns illuminating the interior of this SUV

Also in Terlingua, Texas, two mini lanterns were used to light up the interior of this SUV, which adds a nice contrast to the mural painted on the side of the vehicle.

Various Tea Lamps

Tea lamps are small, low intensity, inexpensive lights that are useful for illuminating tents, windows, and other items in a night scene. I always keep a few in my gear bag, as you never know when they will come in handy. I have two kinds, as seen above.

The lights in the top of the photo are multi-colored and multi-intensity, Flameless LED Tea Lights. They are remote controlled, so that the intensity can be adjusted from a distance. This is useful if setting the lamps up in an enclosed space, such as a tent or automobile. It allows the light intensity to be easily balanced with the ambient light conditions.

The lights in the bottom of the photo are Floral Submersible Tea Lights, which are cheap, small and useful in a variety of situations.

Tea lights illuminate interior of tent

Tea lights can be used to illuminate a variety of subjects, and are often used to illuminate the interior of a foreground element, such as this tent.

Tea lights illuminate interior of Cunningham Cabin

Tea lights are very useful to illuminate the interior of buildings and cabins that are the subject in a photograph. The additional lighting effect adds interest to the foreground and sets it apart from the sky.

Yongnuo YN-560IV with remote trigger

The Yongnuo YN-560IV Wireless Flash Speedlites with LCD Flash Trigger Remote are inexpensive flash units that can easily be transported in ones lighting bag for use in night portraiture, or whenever the photographer want to freeze motion in an image. The remote controller allows easy adjustment of the speedlite output without having to move to each flash position for adjusting. All adjustments are made right from the control unit, which can be mounted on the camera or carried in hand.

Here are two examples of images made using the Yongnuo speedlites for a selfie type portrait taken during a long exposure.

Pondering the Fireflies in Maine

Pondering the heavens in Arkansas

Both of the photographs above include yours truly in the image. I used the Yongnuo speedlites to ensure a motion free selfie, which I blended into the long-exposure foreground to add a little interest to an otherwise ordinary photograph.

Flare Buster mounted to tripod

Lastly, I will present this device called a Flare Buster. It is actually more of an ANTI-LIGHTING device than a light per se, but I am including it here because it is an offshoot of the lighting decisions we make as night photographers. After reading about devices similar to this in Lance Keimig’s fine book, Night Photography and Light Painting, Second Edition, I searched far and wide for a device like this. I finally found it at B&H Photo, and it is called the Extra Long Flare Buster Kit.

Image made possible with use of the Flare Buster kit

This is an image I tried making before owning the Flare Buster. In my previous attempt, the image was rendered unusable due to a giant distracting flare that was created by the glare from the marina lights, just outside the frame on the right of the image. On my next outing to capture this scene, I was prepared with the Flare Buster Kit, and it did the trick. I was rewarded with this shot.


Conclusion


There are many types of lights that can be used in the pursuit of night images. Some are general purpose tools, used frequently by night photographers, and some are more specialized, coming out of the gear bag only occasionally. Whichever methods and devices you use to create your night images are limited only by your imagination, and the lighting equipment you have at hand. In any case, added lighting is a fun dimension to add to your night photography repertoire.

Sigma 20mm f1.4 Art Series Lens For Night Photography, An Alternative View

My “go to” lens for astro-landscape photography used to be a Rokinon 24mm f1.4 manual lens. It seems to be standard advice given out within various night photography groups and publications that the Rokinon 24mm f1.4, along with the Rokinon 14mm f2.8 are the standard for budget minded photographers who want to photograph the Milky Way. After using these lenses for a couple of years now, I have come to a different view, and have been updating my lens collection accordingly. The lenses I have been migrating toward are the Sigma series of Art lenses, specifically the Sigma 20mm f1.4, Sigma 24-35mm f2.0, and the Sigma 50mm f1.4. Since my switch, I have been asked repeatedly about my reasons for the switch, and my impression of the Sigma vs. Rokinon performance. Rather than responding with the same answers multiple times, I am writing this post so that I can simply send a link to the post, and all who ask will get the same uniform response.

First, a disclaimer. I am, by no stretch of the imagination, an expert on lens performance, nor do I possess the necessary experience to opine generally on this topic. But I do feel I can contribute some constructive observations on the lenses in question based on my own particular usage and expectations thereof. So in this spirit, here are my thoughts. As always, YMMV.

The first consideration is cost. Looking at Amazon or B&H, one quickly finds that the Rokinon series of lenses costs roughly half of what the Sigma lenses retail for, some slightly more, some slightly less. If cost were the only consideration (or perhaps the major consideration), the Rokinons would win hands down. On the other hand, if longevity is a consideration, the Sigma lenses come out ahead. The quality control of the Sigma lenses has proven to be excellent in real world use, while the Rokinon lenses are build to a less rigorous physical standard. Additionally, there are many Rokinon users that report having to return Rokinon lenses because of an issue of decentered lens groups, leading to half of the image being out of focus. I have had to return two copies of my Rokinon 24mm before receiving one that was not decentered.

The Rokinon lenses are fully manual lenses, while the Sigma lenses are automatic. The standard story line is that we shoot in manual mode when doing night photography, so it does not matter that the Rokinon lenses are manual. Phooey!! Maybe for you it might not matter, but for me it has become a deal breaker, and here are my reasons why.

1) On a fully manual lens, the EXIF data recorded with the RAW image file (or JPEGS, for that matter) does not contain information on the lens that was used in the shot, nor the f-stop that was used to produce the image. Try going through images you took a month or year ago, and see if you can identify the lens used or the aperture. The same people who advise that a manual lens presents no problem for night photographers seem to contradict themselves, when in other contexts they recommend comparing coma testing results to see what settings are acceptable in actual use. How can you compare the results of two or more exposures, when the EXIF reads f(???) and f(???). Also, has anyone ever asked you what exposure settings were used to create an image, and you had to guess because there is nothing regarding aperture in the EXIF data? How about lens focal length? Are your observational skill sufficiently developed so at a glance you can determine whether an image was taken with a 14mm, 20mm, 24mm or 35mm lens just by examining an image? Mine certainly are not, and I do not like to guess about these settings when examining and critiquing past images.

2) On a fully manual lens the aperture must be set with a ring on the lens barrel. I shoot at night here in the Ozarks as a regular routine, and also in other locations where the temperature and dew point converge. To eliminate fogging, I must wrap the lens barrel with a dew heater or with hand warmers to prevent fogging. This means that I must unwrap the lens to make any aperture adjustment and then re-wrap the lens. Try doing this repeatedly in the course of a shooting session without disturbing the focus or camera positioning – it is difficult, if not impossible. An automatic lens solves the problem. Just adjust aperture using the control dial. No need to unwrap and re-wrap the lens any more!

And now to the main issue most people are asking me about – image sharpness and coma. The Rokinon lenses have a well deserved reputation for being lenses that minimize coma (I’ll use coma here as a proxy for coma and astigmatism). Even when shot wide open, the Rokinons perform exceedingly well in the coma department, much better than the Sigma lenses, which need to be stopped down to achieve the same coma performance. HOWEVER, the Sigma lenses have a well deserved reputation (confirmed on test benches) for incredible edge to edge sharpness throughout the Art Series lineup. Refer to DxO testing and MTF charts to compare the difference between the Rokinon and Sigma lenses. The Sigma lenses win hands down in this regard. While I admit to not having experience with many high-end lenses such as Zeiss or Sony GMaster lenses, I have been truly astounded with the overall sharpness of my Sigma lenses. The sharpness extends from edge to edge, not just in the center, as in the Rokinon lenses, which also appear to be softer in general than the Sigma lenses.

With regard to the Sigma 20mm f1.4 specifically, I have a different view than most when comparing it to the Rokinon 24mm f1.4. When shooting a single frame image (non-pano), if I crop the image to the same field of view as the Rokinon 24mm, the coma affected stars are cropped away, but I gain the advantage of the stunning sharpness of the Sigma compared to the Rokinon, while achieving essentially the same field of view. When I shoot for a panorama, as long as I provide sufficient overlap (I overlap 50%) the coma affected stars are not included in the stitched image, except in the extreme outer edges, which is easy to correct in post processing.

And my last observation regarding the Rokinon vs. Sigma debate. In daytime shooting, the Sigma lenses produce results that are rated among the best lenses. And they are fully automatic, to boot. By giving a little forethought to how I use the lenses at night, I can get the best of both worlds (daytime and nighttime) with the Sigma lenses.

I believe that the photographer should take into consideration the type of night photographs they wish to create in making the decision on which lenses to acquire. My own style is evolving to emphasize the foreground, and reduce the sky as the main element of the image. In this regard, the Sigma lenses excel, especially as compared to images I have taken with my Rokinon lenses. Please feel free to comment with your own experiences with these, or other lenses. I’d love to hear from you!