A priest, electrician or bridge builder would all have an explanation for using the thumb, forefinger and index finger extended at right angles. That symbol explains a lot of principles for me. As shown below, it is a very good way to hold a heavy camera perfectly steady. For an electrically minded person it is the relationship between volts, amps and ohms. Knowing one value determines how the other two values relate to each other.
So it is with photography.
Aperture, shutter speed and sensitivity relate to
correct exposure. Before the digital era, the
sensitivity had to be manufactured into the film
and it was called ASA. The Holly Grail of ASA was
that the standard was set on June 22 at 11am at
the South East corner of the Lincoln Memorial in
Washington, DC. At that sacred place a camera
facing West could take a perfect picture of a
person when the shutter speed was f11 and the ASA
and shutter speed were set to the same value. ASA
sensitivity of 100 required a shutter speed of
Click here to see digital camera advances have changed the rules.
The other characteristic of film was how it behaved when the quality of light effected the way people, trees and bright objects were influenced by flash, natural light and artificial electric light. That also was corrected by the digital revolution when cameras and image processing software could add or subtract any color that was a problem. Click below for more.
Focus has been an issue from the beginning. There is more to focus than meets the eye. In some images, everything seems to be sharp, in others, only one part of the image appears clear and sharp. How do you control this?
To understand this...
Back to photography and art.