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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 07:22:28 +1100
I seem to remember that in the long ago and far away, Pentax made  
some filters that were distinctly curved surface.
They had an odd name which escapes this foggy mind.
Andrew Fildes
afildes@xxxxxxxxxxxxx



On 09/01/2008, at 11:21 PM, Chuck Norcutt wrote:

> Whether flat or meniscus I found it interesting that some large lenses
> do indeed have a protection plate.  But it's also apparent that flat
> plates don't always go well with digital sensors.  Hoya makes that  
> point
> on the coatings for their digital specific filters.  I took that as
> hogwash but maybe not.  I say maybe not since, if the problem could be
> fully resolved with coatings then I think Canon would have taken that
> route rather than redesign to a meniscus lens.



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