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Re: [OM] Third party lenses

Subject: Re: [OM] Third party lenses
From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
Date: Tue, 19 Aug 2003 16:33:27 -0700
Easy question - does the Sigma 600/8 use a T adapter or did they make
camera specific mounts?

If the lens resolution is measured at the film plane image it's not
obvious to me why a longer lens would have a higher resolution. Do you
have any links where I could read up on it? I'm not sure this is what
you were saying but indeed the longer lenses seem to have better ratings
at the link you provided.

Thanks, -jeff

----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxx>
> They are indeed nice, better apparent build quality and much nicer
> finish than the Tamrons. Lee Hawkins gathered together Modern
> Photography tests of many mirror lenses here
> <http://brashear.phys.appstate.edu/lhawkins/photo/mp-cat-tests.txt>.
Of
> course, shooting the same subject from a given spot, the 600mm lenses
> will resolve more detail than the 500mms with the same measured
> resolution because of the greater magnification. Notice esp. the
> comparison to the Vivitar 'Solid Cat', no payoff for the extra weight.
>
> Moose
>

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