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01-05-2011, 12:57 PM   #1
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Quick question - what's this?

Seen on ebay... I know what the lens is, but what's the thing on the right?
Haven't seen an end cap like that, I don't think. Maybe I'm looking at it wrong.

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01-05-2011, 12:59 PM   #2
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looks like a screw on lens cap
PITA they are, but secure
01-05-2011, 01:04 PM   #3
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Oh, it is a lens cap? OK! Looked like a reversing adapter or something.
Thanks, that's all!
01-05-2011, 01:12 PM   #4
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Could have been a reversing adapter but it's solid on the far side (maybe it is with a cap attached to it?

01-05-2011, 01:17 PM   #5
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That's what I thought... Couldn't see a reason for the edge diameter to be much greater than the thread diameter unless something bigger went on the other side. But if there's a lens cap that looks like that, that's what it is.
01-05-2011, 05:28 PM   #6
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Could it be a pinhole 'lens' lens cap?
01-05-2011, 05:30 PM   #7
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Could be a T-mount adapter withe a rear cap on it.
01-05-2011, 07:06 PM   #8
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With a 49mm diameter and what looks like it could be a rear lens cap on the other side I'm guessing it's a reversing ring.

01-05-2011, 11:12 PM   #9
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+1 to reversing ring opinion with the lens cap on the bayonet side...
01-06-2011, 08:16 AM   #10
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It looks like this reverse adpater.

WTSell: Accessory - Pentax K-Mount to M49 Rever... (pHing Classifieds)

Phil.
01-06-2011, 08:20 AM   #11
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thanks Phil i think you solved the mystery
01-06-2011, 09:05 AM   #12
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That does look exactly like it, good detective work!
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