Archived posting to the Leica Users Group, 2003/03/05

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Subject: Re: [Leica] 21mm Skopar opinion(s) please
From: Johnny Deadman <lists@johnbrownlow.com>
Date: Wed, 5 Mar 2003 09:11:19 -0500

well, not to contradict myself but I don't agree with that. Barrel 
distortion with superwides, especially (makes sign of cross) zooms, is 
a real bugbear. The Canon 16-35mm f/2.8 L zoom, an otherwise very 
superior lens, has egregious barrel distortion wide open that has to  
be corrected for many subjects. The distortion becomes particularly 
apparent when, as many digital photographers do, you correct for 
perspective as in a LF camera.

This is when you start realizing the virtues of Leica lenses, and 
primes in general.

Fortunately barrel distortion can be corrected in Photoshop using the 
panotools suite.

Here's a horrible example of uncorrected barrel distortion in the above 
lens:

	http://www.johnbrownlow.com/independence/source/independence0443.html

Here's one where it's been corrected

	http://www.johnbrownlow.com/independence/source/independence0355.html


On Wednesday, March 5, 2003, at 12:22  AM, Slobodan Dimitrov wrote:

> Frankly, worrying about distortion with a wide angle lens is somewhat 
> of
> a princess and the pea concern. 

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