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02-10-2010, 03:55 PM   #1
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Russian TAIR-11A

I acquired a TAIR-11A lens, which was delivered with what I believe to be an M39 T2 mount which had been adapted (with a threaded brass ring) to be a M42 screw mount.

This works fine except that the lens does not focus to infinity and I believe that is because the native M39 mount has a different registry distance to the M42.

I have ordered on two different occasions M42 - T2 adapters both of which will not fit over the "neck" of the lens. The adapter diameter is a millimeter or so too small.

The last one I ordered from ebay was this one:

New T 2 Mount Adapter for Pentax Screw Mount M42 Sonia on eBay.ca (item 160360921694 end time 05-Mar-10 15:29:22 EST)

Anybody able to offer me some help with this broblem?

02-10-2010, 04:01 PM   #2
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M39 lenses are not T2 lenses. T2 has the same thread diameter as M42, not M39 (42mm, not 39mm). But T2 has a different thread pitch (0.75mm instead of 1.0mm). All three of them are entirely different mounts.

You need an M39 to M42 adapter, with no "T"-anything involved. You will still lose infinity focus, and most focus all together, and will only be able to focus on things very very close in front of the lens.
02-10-2010, 04:13 PM   #3
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I am familiar with these basic facts and thanks for quick response!

The TAIR-11A is a native M42 lens. The M39 version is a TAIR-11. The previous owner had been using this 11A lens with the M39 screw thread but did provide the brass ring (adapter) which converted the M39 threads to M42 threads. I believe that the removal/replaceable adapter that we are discussing here is a T2 but I am certainly open to correction!

What I am after is the adapter which will replace the current one with a native M42 screw thread.

Incidentally, the current lens works very well up to maybe 100 ft but nowhere near infinity.
02-10-2010, 04:16 PM   #4
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Ah, then I misunderstood you. Sorry I can't be of any more help!

02-10-2010, 09:45 PM   #5
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Well I have a Tair 11A, that's what it says on the name plate and it has a M39 mount which happily takes a M39-M42 adapter and not a T mount.
02-11-2010, 07:50 AM   #6
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Does it focus to infinity?
What type of M39-M42 adapter - the brass, threaded ring?
02-11-2010, 11:51 AM   #7
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It's the brass ring and no infininity focus. My Helios 40 with M39 mount does focus to infinity but that's another lens. As to whether the Tair can be adjusted to infinity focus I can't say.
02-11-2010, 01:39 PM   #8
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Could you maybe take a pic of the lens' mount?

02-11-2010, 02:14 PM   #9
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Could you maybe take a pic of the lens' mount?
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Alex.

Will do when I get home.

xjjohno:
You have the same problem as me and will also have some interest in the resolution of this question. I do know that with the proper lens mount the problem will be resolved because I do have the proper lens mount for my Nikon (without any other adaptation) and the TAIR does focus to infinity with that.

I am also 95% sure that the native M39 lens mount that we both have is the cause of the problem. I was lead to believe that the lens mount was a T-T2 mount but maybe it is not.
02-11-2010, 05:51 PM   #10
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[IMG]d:/TAIR-11A.jpg[/IMG]

Sorry for the fast pic but am in a hurry...

You can see here the adapted M42 mount and the screws holding the mount. By its side you can see a T2 M42 mount which does not fit over the lens 'neck' due to approx 1 mm too small
02-11-2010, 05:54 PM   #11
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Try again....
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02-24-2010, 02:44 PM   #12
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QuoteOriginally posted by xjjohnno Quote
It's the brass ring and no infininity focus. My Helios 40 with M39 mount does focus to infinity but that's another lens. As to whether the Tair can be adjusted to infinity focus I can't say.
I can now confirm that given the right sized adapter (M42) the infinity problem is solved. You need a T mount that has internal diameter of 49mm. I found a Russian one on ebay and it came in today.
02-25-2010, 12:36 AM   #13
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I don't suppose you could post a link to the seller Steve?
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