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[OM] Re: Tamron 350/5.6 cat

Subject: [OM] Re: Tamron 350/5.6 cat
From: "tOM Trottier" <tOM@xxxxxxxxxxxxx>
Date: Fri, 14 Jul 2006 11:28:28 -0400
Seems to me that Depth Of Field depends on the width of the front lens, so for 
the same light 
gathering ability, is less with a mirror lens because of the middle blockage.

Even with a diaphragm, the DOF could not be less than what you would calculate 
for the width of 
the internal blockage, the secondary mirror.

tOM

--
tOM Trottier, Ottawa, Canada
        758 Albert St, Ottawa ON Canada K1R 7V8 
        +1 613 231-6115 N45.41235 W75.71345 
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"The moment one gives close attention to anything, 
even a blade of grass, it becomes a mysterious, 
awesome, indescribably magnificent world in itself "
-- Henry Miller, 1891-1980


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