Introduction
I am a photograher, digital artist and analytical chemist, who graduated from Union College in 2009, living in Mechanicville, New York. I use light in its many forms to create artwork. Primarily I focus on photography, and digital works created from photographs, but I occasionally branch into other forms of art such as painting, digital painting, and sculpture.
My goal in creating this blog is to provide some helpful context to my photographs. Often fine art photographers post their work online without any explanation to how the image was created. While every artist must have their secrets, I feel it serves the art community well for artists to explain some aspects of their work.
Photography is a unique art medium as it solely utilizes a complex piece of technology in its creation. The medium inherently requires a basic understanding of technology in order for discussion of its creation to proceed. While I do not want to explain each technical aspect of the camera, in order to understand my posts I would like to lay down the basics.
Photography Basics
While cameras exist in many different forms from
digital point-and-shoots,
camera-phones,
webcams, and
SLRs (Single Lens Reflex), fine art and professional photographers primarily use digial SLRs to create their work. DSLRs allow maximum control of image making, allowing the user to change lenses to suit their needs, quickly set aperture, ISO sensitivity, and shutter speed.
Shutter Speed
Adjusting shutter speed alters how long the image sensor is exposed to light. It is most commonly referred to in seconds and fractions of a second. A fast moving subject such as an athlete will require a faster shutter speed in order to avoid a blurring. Longer shutter speeds are used to capture more light, such as shots taken at night, or images of waterfalls.
This is a 30 second exposure of a stream at night. The light source was two streetlights, one orange, and one fluorescent.
You can also employ a few tricks with long exposures. I'll let you figure out how the following image was made.
Aperture
Aperture is an iris inside the lens that closes as the shutter is released. It controls the depth of field of the photograph. Often in close-up images of flowers or insects the focus of the image is sharp, but the background is blurry, this is depth of field.
As the iris closes smaller, aperture number increases. As aperture number increases, sharpness of the image increases, and parts of the background will come into focus.
Ansel Adams is known for his extremely sharp photographs. However, as the iris decreases, light that hits the sensor decreases as well. Some of Ansel Adam's photographs had such a small aperture that they required half an hour exposures. A balancing act between shutter speed and aperture occurs within every photograph according to the photographer's desires.
ISO Sensitivity
During the film era, a photographer selected the film ISO speed they wanted for their given application, and they were stuck with that speed until they finished that roll. Today, ISO speed in digital cameras can be set on the fly. ISO sensitivity is simply the sensor's sensitivity to light. Sensitivity increases with ISO number from 200 to 400 and now with recent cameras, up to 32,000. The downside to increasing sensitivity is that noise also increases. Currently camera manufacturers are pushing their ISO performance further which will allow their cameras to have better low-light performance, something especially sought after by event photographers at concerts and weddings..