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Industar I-50 vs I-61, different register distance
  
 
CalBoy87
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p.1 #1 · p.1 #1 · Industar I-50 vs I-61, different register distance


Hi. Not sure if this is right forum, but I though maybe someone is using those lenses on Sony. Got few Industar lenses from eBay. I am using them with M39-NEX adapter. I-26 and I-61 are working well, but I-50, doesn't. Its register distance is much shorter, so the lens, can't focus at all. Anybody has come across such lens, and if so, what adapter can I use for that beast?
Thank you for any pointers.
Here is the picture of it







Mar 15, 2017 at 12:50 AM
newst
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p.1 #2 · p.1 #2 · Industar I-50 vs I-61, different register distance


Two possibilities:

Back in the old days the Soviet Union produced an SLR camera called the Zenit. Zenit cameras used a 39mm screw mount (M39) but were designed with the same back flange distance as universal M42 SLR cameras. In my experience, the 'pancake' versions of the I-50 are Zenit lenses.

The easiest way to get this lens to work is to get an M42 adapter and an M39 to M42 ring adapter.

OR, someone has opened the lens and messed things up inside.




Mar 15, 2017 at 09:33 AM
MartinV
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p.1 #3 · p.1 #3 · Industar I-50 vs I-61, different register distance


That's pretty much right - if the image is of the lens you have, you have the SLR version of the I-50. The threaded black ring in the front is the M39-M42 adapter that you need in order to use the lens with a common M42 adapter.

Your other Industars have a register distance of 28.8mm (typical M39 / LTM), the I-50's register distance is longer (45.2mm), not shorter. It's not exactly the same as M42 (45.5mm), but depending on tolerances it might not be a problem at all.

You should be able to use what you have in that picture with a simple M42-NEX adapter.



Mar 15, 2017 at 11:05 AM
CalBoy87
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p.1 #4 · p.1 #4 · Industar I-50 vs I-61, different register distance


Got it, thank you both for helping out. Strange though that all lenses were ad as M39, but had a different register distance. Now I know, there are some different version of it, thanks.


Mar 15, 2017 at 12:51 PM
 

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newst
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p.1 #5 · p.1 #5 · Industar I-50 vs I-61, different register distance


Just remember if you are buying Soviet era "M39" lenses that if the description includes "Zenit" or "SLR" it will not work with a Leica LTM/M39 mount camera or adapter.

The M39 actually refers to the mount design of 39mm diameter thread. It doesn't refer to the lens' back flange design. Most times that's not a problem but Zenit lenses and the Industar-69 28mm lens are NOT compatible without additional work on your part.



Mar 16, 2017 at 12:47 AM
jcolwell
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p.1 #6 · p.1 #6 · Industar I-50 vs I-61, different register distance


I have the same lens (ИНДУСТАР 50-2 50mm f/3.5) in M42 mount and with black colour, with the 45.5mm Pentax register. Note that my label says "-50-2", not "-50", as on your lens. I don't know what that means.


Mar 16, 2017 at 11:42 AM
MartinV
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p.1 #7 · p.1 #7 · Industar I-50 vs I-61, different register distance


As far as I know, the -2 suffix indicated the move from M39 to M42 for some SLR lenses, such as:
Industar 50 -> Industar 50-2
Helios 44 -> Helios 44-2
Helios 40 -> Helios 40-2
Jupiter 6 -> Jupiter 6-2

For some other lenses, such as Jupiter 9 and Mir 1, the numbering was not altered with the move to M42, which happened around 1968.



Mar 16, 2017 at 12:58 PM
jcolwell
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p.1 #8 · p.1 #8 · Industar I-50 vs I-61, different register distance


My Industar-61 LZ 50/2.8 Macro is M42. I guess it fits in the "non -2" group, too.


Mar 16, 2017 at 01:04 PM







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