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Re: [OM] Tamron SP 350mm f5.6 mirror lens

Subject: Re: [OM] Tamron SP 350mm f5.6 mirror lens
From: Thomas Bryhn <thomas.bryhn@xxxxxxxxxx>
Date: Fri, 16 Mar 2001 10:02:46 +0100
At 14:09 15.03.01 -0500, John Raymond wrote:

VERY interesting! I shot all my pictures with my Ser 1 Viv 450/4.5 with an OM 4 in auto so all looked great ofcourse. I see where the t-mount could make a difference but can it actually cause the finder to go darker when the lens is a fixed f stop?

Nope, but the difference between f/4.0 and f/4.8 can. That's why I suggested you try to set the Tamron to f/4.8, press the button or lever to stop it down and then compare the two in the viewfinder. If you still see a difference then something is seriously wrong with that Vivitar, but it doesn't apply to mirror lenses in general. Their f/-numbers are as reliable and correct as the ones for refractive lenses.

Regards,
Thomas Bryhn


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