Re: [Leica] Center filters

[John Collier <jbcollier@home.com>]

I am with you on the degradation issue but that is not why super wides use
centre filters. The centre filters compensate for the inherent edge
vignetting of super wide angle lenses.

John Collier

> From: "A. H. Ongun" <ahongun@ecsysinc.com>
> 
> Tom,
> 
> That's absolutely correct, and that is why Schneider sells center filters
> made specifically for each of their wide angle large format lenses.
> 
> andy
> 
> -----Original Message-----
> 
> I have always wondered whether use of filters is more problematic with
> extreme wide angle lenses.  It seems to me that, while at the center, the
> light path is perpendicular to the filter, at the edges, the light path is
> more oblique.  It therefore strikes the filter at an oblique angle, and
> travels through more glass than at the center of the image.  Therefore, I
> would expect degredation, or at least differences, at the outer areas of the
> frame.  What are your thoughts on this?
> 
> Tom
>