Stating the obvious? I think we sometimes forget the fundamentals of what we are doing and working with. No light, no photography. Photography is about light.
Writing with light
Remember that our word “photography” comes from 2 Greek words that together mean “writing with light”. So from the beginning of our art form it was understood that we were recording light on some type of photo sensitive material. Glass plates or tintype or film back then. Mostly digital sensors now.
Technology changes but still we are recording light.
Embrace that. It is what we are all about as photographers. Photography is about light.
Low light is not no light
Our technology improves all the time. It is possible to get sensors that do a fair job of imaging at 250,000 ISO. Maybe more. I don’t track the latest. The highest ISO I found with a quick scan was the Nikon D6 at 3,280,000!
A 250,000 ISO is about 11 stops of additional exposure above a nominal ISO 100 setting. Eleven stops is a huge amount as exposures go. I haven’t tried it, but at ISO 250,000 I bet you could make a properly exposed hand held landscape shot lit only by starlight.
But the point is that very low light is not the same as no light. Have you ever been in a cavern deep underground where they turned off all lights at some point? Then we encounter the eerie experience of actual, total blackness. In those conditions it is impossible to see anything. Put your hand right in front of your face and you can’t tell it’s there. There are absolutely no photons to impinge on our retina.
We could do no photography in total blackness. Of course, other artists would be almost equally disadvantaged. I suppose, theoretically, painters could make marks on their canvas in total blackness, but they would have no way to know what they were creating. Sculptors could mold clay by feel, but would have very limited feedback on what they were doing. But photographers cannot do anything without light.
©Ed Schlotzhauer
Computational photography
One clever way to get better results in low light is used in your cell phone and by astronomers. It is generally called “computational photography”.
Computational photography does not rely on the result of one frame. Instead, tens to thousands of shots are taken and processed by computer to bring out detail.
This is how your phone takes decent pictures in low light despite having a tiny sensor. It is actually shooting bursts of dozens of frames. Then it quickly processes them in the phone. It uses averaging and other more sophisticated techniques to reduce noise and bring out the desired detail. I am surprised at how well it works.
Astronomers have special needs in photographing distant galaxies. The light levers are so low that there is nothing to see with our eye. So they instead take hundreds, maybe thousands of images with the regular sensor on their telescope and run them through dedicated processing software. Using combinations of specialized image processing algorithms and AI, their computers “reconstruct” what is probably there.
My astronomer friends have shown me some of their new “telescopes” they got recently. Generally they about the size of a moderately thick hard cover book. They rely on small, cheap optics and lots of computation, but produce amazing results.
Techniques like these let images be created in what seems like black conditions. But the reality is, it is not black. Just very low levels of lighting. If it was actually black, no photography.
©Ed Schlotzhauer
See the light
As I said, the purpose of this is to remind us that our art is based on light. We need to develop a heightened awareness of the light around us, because it is critical to our art. It changes all the time and is different in different conditions.
it has been observed that a fish probably does not think about water. But we need to think about light, which is almost as important to us as water is to a fish.
Light has many characteristics and most all of them affect our photography.
We need to be intensely aware of the quantity of light at any time, its color, is it direct or diffuse, it’s angle, whether it is steady or changing, is our subject lit directly or indirectly, and many other properties. It sounds complicated. But learning the light is part of the craft. Learning to apply it creatively is part of the art.
For instance, it is almost an axiom of photography that you do not photograph in the middle of the day. Like the “rule of thirds”, this is one of those rules I take pleasure in violating. The reality is that it completely depends on what subjects you are shooting, the nature of your light source, and what your goals are. Shooting at midday often enhances the texture of materials. In a dense forest it can create interesting dappled light patterns. In a slot canyon or a cathedral it can create beautiful light beams. And diffuse overcast light may be perfect for many subjects, with high brightness and soft, even illumination.
©Ed Schlotzhauer
And as a practical matter, I am not a National Geographic photographer on assignment. I can’t spend a week in the field waiting for the “perfect” shot I went out to find. I have to be creative enough to make the best use of what I find at the time I’m there.
There are no rules, only what you can do with what you have.
Tonality
Tonality is one of those important things we need to think about and know how to use. It simply refers to the difference of luminance of the parts of our image. The tonality is what lets us distinguish all the parts. It creates separation of various areas.
Think of a blank white piece of paper. This effectively has zero tonality. There is no image, because without tonal separation we cannot resolve anything. Any actual image we create has a range of tones.
If the tones are squished together, our image is low contrast. Not much tonal separation. Maybe this is what you want, like a foggy scene.
On a sunny day there is a wide range of tones. We refer to it as high contrast. Sometimes it can be too much. Do we need to use exposure or editing techniques to tame the contrast? But that is our creative choice
A low key image involves pushing most of the tones down towards dark. But the remaining light tones stand out. Likewise, if we create a high key image, with most of the tones pushed toward light, the remaining dark tones stand out.
Our eyes are very sensitive to tonality. We perceive tiny differences in illumination levels. Use of tones is a creative process. It should be part of our thought process and tool box.
One of the ultimate expressions of pure tonality is black & white photography. All color is stripped away, leaving only tonality to create the image.
©Ed Schlotzhauer
Color
Our eyes are an incredible design. The rods and cones have different purposes but work together to give us sight. But overall, our eye is less sensitive to color than to illumination levels.
Think of being in a dim room at night. We can make out the objects around us, but the colors are hard to distinguish. Turn the light on fully and the colors pop.
Similarly, in our images, good color requires good light. We can’t see vibrant, saturated color in dim light. I mentioned low key art. Have you noticed that most of it is black & white? This is a practical result of not being able to see much color in low light.
I believe some people’s artistic vision is drawn to color and some to black & white. If you are a color person you have to be doubly aware of light. Not enough and our brilliant colors fade.
©Ed Schlotzhauer
Creativity
All art processes are defined by their technology. Photography is based on light. We cannot do photography without light. To be a photographic artist, we need to be intensely aware of light and how to use it to our advantage.
Recognize it not as a limitation, but as a creative tool. Light is a marvelously varied thing. We are artists, We paint with light. Learning it and being constantly aware of it and deciding how we want to use it for any image is part of the art.
We are seldom in a place where there is no light, like the underground cavern I mentioned earlier. There is always light around. It may just be moonlight or city lights or a flash. We may decide there is not enough light to make the image we want sometimes, but there is always light to work with. Recognize it. Use it creatively.
Light is fundamental to photography. Learn to see it for what it is and learn to use it creatively. It is what you are photographing.