[OM] Re: focus and ? about lens filters

[Winsor Crosby]

Then it is not a filter, it is an optical element.



Winsor
Long Beach, California, USA




On / January 8, 2008 CE, at 9:44 PM, Andrew Fildes wrote:

> Some lenses with rear filters like old fisheyes have to have a
> 'normal' filter in position - the lens requires a piece of glass
> right there for optimum performance.


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