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[OM] Re: focus and ? about lens filters

Subject: [OM] Re: focus and ? about lens filters
From: Andrew Fildes <afildes@xxxxxxxxxxxxx>
Date: Thu, 10 Jan 2008 08:04:53 +1100
Good job that the world is flat...
Andrew Fildes
afildes@xxxxxxxxxxxxx



On 10/01/2008, at 7:09 AM, Donald wrote:

> And I read an article once in Professional Photographer which said  
> that
> the curvature on an 'optical flat' for astronomical and scientific use
> described a circle that would fit inside London. Filters were measured
> to be worse...
>
> Everything is relative...



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