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Re: [OM] Generic lenses for Oly OM equipment

Subject: Re: [OM] Generic lenses for Oly OM equipment
From: PCACala@xxxxxxx
Date: Sun, 22 Feb 1998 13:18:22 EST
Hello Doug:

<< The f/32 may be of little practical importance. As a rule, this is too
small
 for best sharpness with a 90mm lens. The point is reached where loss of
 sharpness from the small aperture is worse than loss from DOF. >>

f/32 will not be theoretically diffraction limited at infinity through 1:2.5
reproduction.  It will at 1:2, 1:1, etc.  However, small aperatures are less
sharp and I suppose that Vivitar had a higher standard than Tokina in this
matter.

Gary Reese
Las Vegas, NV


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