How does one design a 'fixed' compendium hood. The meaning of fixed is the hood is CNC'ed from a solid block of material. This would be for use on a camera using only a single lens (not interchangeable), 150mm f/l and the film is 6x12.
It seems the opening should be a ratio of 12 : 6 or 2 : 1. That's straightforward. Let's say the hood will be 3" x 6" opening. How far from the lens should this opening be to have maximum shielding effect without causing vignetting?
One could calculate the angle of the opening (on the film side) knowing the 6x12 image is formed 150mm from the lens. But the hood goes on the opposite side, so does one use the thin lens equation?
I did a quick search of the web and this forum but did not see anything close to the topic.
_..--
TiM
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