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Re: [OM] Re: Lens Shade Shapes

Subject: Re: [OM] Re: Lens Shade Shapes
From: Jim Brokaw <jbrokaw@xxxxxxxxxxx>
Date: Sun, 30 Jun 2002 11:38:53 -0700
on 6/29/02 4:50 PM, Dave Dougherty at davdou@xxxxxxxxxx wrote:

> Why is the lens shade "petal" shaped (for want of a better term) on the
> E-10/E-20 and many other higher end cameres?  Is it just to look sexy or
> does the shape have some real function?
> 
> Dave Dougherty

That shape is what's left if you cut a projected rectangle away from a
cylinder... its called the 'ideal' shade because in theory it is as close as
you can come to the image-forming light rays without blocking any of them.
So it should block as much extraneous light as is possible without
vignetting.
-- 

Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney... 


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