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[OM] Re: New Base for OM Lenses

Subject: [OM] Re: New Base for OM Lenses
From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
Date: Tue, 23 Aug 2005 21:49:28 +0800
I'm really interested to know what software can deal with chroma, some years 
ago people say Panorama Tool can do this and even provided a formula for 
correcting E-10's barrel distortion and chroma. Finally the distortion is 
correction but never the chroma, I suddenly remember there are color shift 
only on the bright white light area how can they correct this without 
affecting the other normal area around them?

The problem of C*non lens on full frame is not only vignetting and chroma, 
the resolution is also seriously affected, I have seen their own test sample 
with the 16-35/2.8 on 1D MKII, they edges resolution was really suffered and 
it was not even FF.

C.H.Ling


----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>

> Ooops!  Faulty memory.  I just went back and looked at the 1Ds review in
> dpreview <http://www.dpreview.com/reviews/canoneos1ds/page16.asp> and
> see that he points out some chroma at 28 and 17mm around high contrast
> areas near the edge of the field.  Also reminds folks that their full
> frame lenses likely show some vignetting that doesn't show on a smaller
> sensor.  Well, I assume PhotoShop will deal with the chroma and the
> vignetting if necessary.
>
> Chuck Norcutt
> http://www.chucknorcutt.com/



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