Weird lens mount identification request

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SimonKlanfurt

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Aug 28, 2016
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Hello Photogs,

today I got this weird lens without a suiting body and I can't figure out what lens mount it has. It is a very small Bayonet so I consider it could be a rangefinder lens. The inner diameter of the rear lens cap is ~ 38 mm.

Thanks in advance.

 
It looks like a T-2 mount lens with an Exakta adapter, though it could be aligned forTopcon. If it is a T-2 mount lens, the rear knurled band is part of the adapter and the adapter will screw off leaving a 42mm (not 44mm) male thread on the lens.

They are actually the same mount except that the Topcon variant rotates the mount about 90 degrees. Exakta had a release button on the left side of the body and when they added their semi-auto, and later full auto, diaphragm mechanism they had to use an external connection to the shutter release button. Topcon copied the mount, but put the shutter release on the more conventional right side which requires the "top" of the mount to be different.

With T-2 adapters, as opposed to the original T version, you can loosen the 3 grub screws around the adapters knurled sides and rotate the two parts of the adapter to properly align the scales on the lens to the top.
 
Last edited:
Dwig said:
It looks like a T-2 mount lens with an Exakta adapter, though it could be aligned forTopcon. If it is a T-2 mount lens, the rear knurled band is part of the adapter and the adapter will screw off leaving a 44mm male thread on the lens.

They are actually the same mount except that the Topcon variant rotates the mount about 90 degrees. Exakta had a release button on the left side of the body and when they added their semi-auto, and later full auto, diaphragm mechanism they had to use an external connection to the shutter release button. Topcon copies the mount, but put the shutter release on the more conventional right side which requires the "top" of the mount to be different.

With T-2 adapters, as opposed to the original T version, you can loosen the 3 grub screws around the adapters knurled sides and rotate the two parts of the adapter to properly align the scales on the lens to the top.
Click to expand...

I would think 42mm x 0.75mm.

... I agree with the rest :)
 
Sumarongi said:
I would think 42mm x 0.75mm.

... I agree with the rest :)
Click to expand...
Yup, good catch. Fat typing fingers to blame (and substituting the 44mm of the Miranda thread when I all too quickly proofread my post). The T thread is the same diameter as the Praktika/Pentax M42 but uses a finer pitch.
 
Thanks for the replies. The Bayonet wont screw off. It is fixed in place by 3 side screws. I took it off after removing those screws. The Bayonet is just press fitted on a clean round surface. Probably this makes it possible to change lens mounts.
 
SimonKlanfurt said:
Thanks for the replies. The Bayonet wont screw off. It is fixed in place by 3 side screws. I took it off after removing those screws. The Bayonet is just press fitted on a clean round surface. Probably this makes it possible to change lens mounts.
Click to expand...

I presume your native language is German (you're from Kla[ge]nfurt?) -- you can find lots of Exakta related information here:

https://web.archive.org/web/20171016113206/http://photobutmore.de/exakta/objektive/enna/

The site doesn't mention your 135mm lens, but a Wide Angle *Eximar* lens.
 
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