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Odd part needs identifying.
Old 01-11-2017   #1
David Hughes
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Odd part needs identifying.

Hi,

I bought this in a charity shop because it came with a Hoya UV 40.5mm filter but what is it? The other side is flat with 40.5MM printed on it and in all it's just under 2 inches in diameter.




Regards, David
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Old 01-11-2017   #2
ronnies
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Is it an adapter for the Cokin square filter system?

Ronnie
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Old 01-11-2017   #3
sevo
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Adapter for some filter or compendium holder system - there have been many mutually incompatible ones around. The small Cokin holders were immensely popular among 1980s amateurs, but if it comes from a (former) pro, it is more likely to be a adapter for a 75mm gel holder.
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Old 01-11-2017   #4
oltimer
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That's the right size for Cokin A series. My Cokin P is another inch wider. Dave I believe that adapter fits one of my 50mm early Canon screw mount lenses.
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Old 01-11-2017   #5
David Hughes
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Thanks everyone.

It makes sense as I've never bothered with filters (but like to have them for when I sell cameras). What baffled me was why anyone would want to screw a metal plate into the filter thread...

Thanks again. Regards, David
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Old 01-12-2017   #6
David Hughes
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Just a thought, that thing is no use to me, so if anyone in the UK wants it, just ask.

Regards, David
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Old 01-12-2017   #7
LukasB
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Just to chime in another theory I bought a Ring Light from Amazon a few Years ago... it looks very similar to the filter attachment for the Main Unit that would hook onto the extended collar. (There were a number of different sizes included from 49mm - 72mm if I'm recalling correctly.) I imagine the same system in which the Cokin filters work, though I have very little experience with them.
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