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05-23-2015, 06:43 AM   #1
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Desperate help!

Hiya everyone I have been searching for ages to find out what lens mount this lens has. My m42 adapter wont work for it. Any help would be greatly appreciated THANK YOU!#

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05-23-2015, 06:58 AM   #2
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Looks like a flanged (non-threaded) T mount. You will need to find a t adapter that has 3 set screws to secure onto the flange.
05-23-2015, 07:27 AM   #3
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I think that's half a T-mount

I've seen this before. What I think you have there is an M42 lens, but with the inner ring of a t-mount attached.
Someone mistook M42 threads for t-mount - they're close, but not the same.
Anyway, you've got the useless inner ring stuck on there. With enough grip, you should be able to unthread it and reveal the M42 underneath.

The reason it's not a t-mount lens to begin with is that it has an aperture plunger. While there were some early '70s lenses with plungers and t-mounts (think Spiratone and early Sigma) the lens you have there is too new for that, I think.
05-23-2015, 07:28 AM   #4
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From what I could find, it looks like Sirius 28-200 lenses usually had a two letter code on the aperture ring, to the right of the '4'. That should give a clue as to which mount it is. It looks like they used 'PU' (Pentax Universal) for M42.

I wouldn't get my hopes up - Samyang-made push-pull lenses of that period weren't great, and the word 'doorstop' seems to come up often in reference to that lens.

05-23-2015, 07:30 AM   #5
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Good catch on the aperture pin. This is probably the correct identification.

QuoteOriginally posted by Ontarian50 Quote
I've seen this before. What I think you have there is an M42 lens, but with the inner ring of a t-mount attached.
Someone mistook M42 threads for t-mount - they're close, but not the same.
Anyway, you've got the useless inner ring stuck on there. With enough grip, you should be able to unthread it and reveal the M42 underneath.

The reason it's not a t-mount lens to begin with is that it has an aperture plunger. While there were some early '70s lenses with plungers and t-mounts (think Spiratone and early Sigma) the lens you have there is too new for that, I think.
05-23-2015, 07:33 AM   #6
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QuoteOriginally posted by Ontarian50 Quote
I've seen this before. What I think you have there is an M42 lens, but with the inner ring of a t-mount attached.
Someone mistook M42 threads for t-mount - they're close, but not the same.
Anyway, you've got the useless inner ring stuck on there. With enough grip, you should be able to unthread it and reveal the M42 underneath.

The reason it's not a t-mount lens to begin with is that it has an aperture plunger. While there were some early '70s lenses with plungers and t-mounts (think Spiratone and early Sigma) the lens you have there is too new for that, I think.
Thank you so much everyone! Ontarian50 you was right and I quickly got it off now and my m42 adapter works a treat
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