The Tamron 500/8 filter are 30.5mm. Those are about the smallest I
remember seeing.If you could pick up a good UV filter you could
probably get an optician or maybe even a stained glass shop to cut it
into a circle that could replace your ND glass.
-jeff
On 3/29/07, Scott Peden <scotpeden@xxxxxxxxxx> wrote:
>
>
> I looked on Ebay and didn't see and Sigma 22.5 filters. They come in a
> clear?
>
> Scott
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