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09-24-2019, 08:33 AM   #1
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shaolen's Avatar

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Location: Phoenix AZ
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C-mount 8-48mm filter size?

I have a Pentax 8-48mm c-mount lens and I'm not sure what the filter thread size is. Anyone know for sure what size this lens takes?

---------- Post added 09-24-19 at 08:07 AM ----------

Nevermind. Looks to be 57mm which is a crazy hard size to find a good lens hood for. Or even step up rings

09-24-2019, 09:40 AM   #2
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So, assuming it's not a standard 58mm size, it doesn't look like an old-school Series size either.

Series VII is close to a 52mm size, and Series VIII is closer to 62mm - so it's not either of those.
09-25-2019, 11:01 AM   #3
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Could be a 2 1/4" lens ?
09-25-2019, 02:30 PM - 1 Like   #4
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The 2012 Pentax catalog of machine lenses lists it as 55mm. Are you sure about the 57mm measurement?

A 55mm to 58mm step up ring is common.

You could also go 55mm to 52mm step down, it probably wouldn't vignette and make for a neater package with a lens hood (although that might vignette at 8mm.)

10-02-2019, 11:44 AM   #5
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Just wanted to update that I have ordered a 55mm lens hood. Wish me luck!

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