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[OM] Re: Tamron lenses was Re: PLEASE QUIT!!!!

Subject: [OM] Re: Tamron lenses was Re: PLEASE QUIT!!!!
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 01 Mar 2007 18:27:29 -0500
Very interesting lens but I'm afraid there is something wrong with this 
picture.  A 70-350mm f/4.5 lens needs a clear aperture of 77.8mm.  The 
82mm filter size listed on the lens is consistent with that.  However, 
the seller goes on to state that the maximum aperture is f/6.3 from 140 
to 700mm.  It's clear that the 140-700mm range is coming from the 2X 
converter which, applied to a 4.5 lens will yield a f/9 lens, not an 
f/6.3 lens.

Chuck Norcutt

Jeff Keller wrote:
> 280083086512 shows several views of a lens in a Tamron auction labeled
> 350/700mm Tamron f4.5 Telephoto C*non N*kon P*ntax
> 
> which matches exactly what Allen had posted. One of the views easily
> shows 34deg - 7deg and partially shows 0-350mm 1:4.5. It has an
> aperture ring showing in a window AE 32 22 16 the rest presumably
> hidden by the window. I don't know if this is what Allen saw but it
> matches what he posted and sure looks like a zoom to me.
> -jeff

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