There are some lenses that come with 'dedicated' filters. And some of
the Canon big whites are reputed to have a flat, no effect front
element for protective purposes. In those cases, the effect of the
filter is built into the formulation so it should be used, like the
'normal' filter in rear mount Tamron/Sigma 500mm mirrors and superwides.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 21/04/2007, at 2:29 PM, Moose wrote:
> It is theoretically possible to design a filter for any given prime
> lens
> that doesn't suffer from that problem, but then it's really a special
> lens with zero focal length effect and no abberations. And so
> expensive
> you would need a filter for it in dangerous conditions. :-)
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