Danny Schweers Photography and Design

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Photographic Variables on
Digital Single Lens Reflex Cameras

Many variables are at the photographer's command before a picture is taken.
Here a list:

YOU CAN CHANGE what's framed in the viewfinder.
This is determined by:

  • Where the camera is pointed.
  • When the camera is pointed.
  • The focal length of the lens.

YOU CAN CHANGE the lights and darks of the image (exposure), and color fidelity.
This is determined by:

  • Light reflected from subject and light produced by subject
  • Shutter speed
  • Aperture
  • ISO setting (sensitivity of sensor)
  • White balance
  • Number of pixels captured and their bit depth
  • File format of captured image

YOU CAN CHANGE the sharpness of the image.
This is determined by:

  • Quality of the lens
  • Focus
  • Shutter Speed relative to the motion of the subject and the camera
  • Depth of Field (adjusted by changing the aperture or f/stop)
  • Number of pixels captured and their bit depth
  • Filter on the front of the lens

Other Camera Variables

Perhaps you can think of other variables I've missed here.
If so, please contact me, Danny Schweers.

General Photography Advice


The best advice I can give you about lenses is to visit your local camera store. In Delaware, I recommend Cameras, Etc. in Newark. Call them at 302 453-9400. Visit their store for advice, then purchase your equipment there. You may pay a bit more, but when you have a problem they are there to help.

In general, a fixed lens will give you better images than a zoom. Long telephoto lenses are expensive if they are of good quality. You can cheaply add an extension ring to your camera to increase its focal length by 1.4 or 2.0, but the quality is not good. Many photographers, instead of buying heavy pricey lenses, find ways of getting closer to their subject and using the lenses they have.



All pages copyright 2000-2018 Danny N. Schweers