Usually they are found in a set with a normal, a red, yellow and a
light blue for colour correction.
Not uncommon - in Sigma and Tamron brand. The other common size is
30.5mm as I remember.
AndrewF
On 02/04/2006, at 5:27 PM, Darin wrote:
> The filter in mine is marked "SIGMA NORMAL JAPAN",
> but it appears to be the 22.5mm. What types of filters are availble
> in this size?
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