I would be interested in a discussion of film speed and bellows extension. In general I seem to need about a three stop adjustment to my meter readings from the specified film speed. By this I mean that 3000 asa seems correctly exposed when corrected to a film speed of around 400...now this is for medium
depth focus 8-25 feet.

Does this seem about right?

Kim Hartshorn

Your recently found copy of Ansel Adams' Polaroid Land Photography has something about that on page 300, I think. Unfortunatly, my copy suffered from a roof leak and those pages won't be coming apart in a readable form.