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Re: 21/2 vs 21/3.5 (was: [OM] 28/2 or 35/2?)

Subject: Re: 21/2 vs 21/3.5 (was: [OM] 28/2 or 35/2?)
From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
Date: Tue, 30 Jul 2002 10:45:19 +0800
Field curvature and linear distortion is two different things, field
curvature means shift of focusing in the film plane (i.e. for high
field curvature lenses when you focus at the center, the edges will be
out of focus).  

C.H.Ling

plp@xxxxxxxx wrote:
> 
> >I have own the 21/3.5 briefly (for two weeks and just
> >sold), for close distance the 21/2 perform much better
> >than the 21/3.5 which has very high field curvature.
> 
> What do you mean by high field curvature?  Are you saying
> that the 21/3.5 has significantly more barrel distortion
> than the 21/2?
> 
> Pete

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