Lens Visual Perspective
Here are some rules of thumb for previsualizing the lenses you will need.
21mm - all of your peripheral vision with both eyes
35mm - your field of view with your eyes facing forward
50mm - the part of the 35mm scene you can remember a minute later
85/90/100mm - the field of view of one eye.
I am not sure of the source of this quote. I copied it into my PDA a few years ago.
Stephen Cysewski
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