student said:Thank you indeed!
Such sound wisdom, and so clearly and succinctly expounded! We now understand fully what you are saying. I am sure all of us are indebted to your kind efforts to show us the light.
Now I have this silly spot meter. And I just pointed it at the white dress my friend is wearing, and it reads f8 speed 1/125. MY ISO is 400.
Now please enlighten me more in your so concise and succinct manner. Shall I set my shutter speed to 1/125 and f8?
*ponder*
Open 2 1/2 stops for an absolutely white background.
2 stops to retain some details in the highlights.
As for silver hallide film, plonk in an extra stop anyway to play safe and to ensure most of the shadows are well exposed, and +/- 20% time of dev depending on the need to contract/expand the tonal range.
Prefer to use dilute dev with minimal agitation though and over develop.
And try not to read too many logarithmic scales of film characteristics versus exposure and get some well deserved rest.
And do my damn presentation slides..argh.