--- [EMAIL PROTECTED] wrote:
> Hello,
>
> I'm (still) trying to decide on a wide angle zoom
> for 35mm.
> The 20/2.8 has a 72mm thread and rates the same as
> the 20-35/3.5-4.5, which has 77mm threads, but what
> looks like the same size front element.
>
> Has anyone used the Cokin P system for 20mm?
> Should I expect vignetting?
> Is the difference in close-focus significant?
Hi Julian,
Re the Coking P system:
I can't comment on either of the 20-35 zooms as I
don't own either, but I do own a Sigma 17-35 EX (my
only non Canon lens and very happy with it too for the
price!).
I use the Cokin P system with my other lenses (either
72mm or 58mm filter diameters) and it's fine with
them. The 17-35 EX however has an 82mm front element
(it REALLY hurt shelling out the money for a circular
polarizer there!!) and vignetting with the P holder is
a problem.
My solution - not very elegant - is to simply hold the
filter in position with my fingers when using the
17-35. It works, albeit somewhat clumsily. You can
either hold one or two corners depending on your
method of camera handling and there's NO vignetting -
unless of course you let the fingers stray just a
little too close - my viewfinders don't cover 100% so
that's alway a possibility.
One advantage of this approach is there's also no
vignetting even if another filter like a UV or C-PL is
already in place.
Regards
Gary
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