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Re: [OM] Lenshood calculation

Subject: Re: [OM] Lenshood calculation
From: Moose <olymoose@xxxxxxxxxxxxx>
Date: Mon, 13 Jan 2003 11:49:40 -0800
Film plane doesn't work. You need to know where the front node of the lens is relative to film plane or front of lens or rear of lens mount, etc. Then it would be simple geometry.
Would that it were so simple.
Notice how the same hood for the 100/2.8 and 85/2 also fits the 40/2. That's because of different relationships of the physical front of the lens to the front node.

Moose

tOM Trottier wrote:

Does anyone have an equation to calculate what diameter a round lenshood should be for a given focal length and distance from hood edge to film plane?




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