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02-06-2011, 02:35 PM   #1
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INDUSTAR 69 28mm F2.8 - Is this lens "Pentax-able"



I'm curios whether this lens can fit Pentax bodies, and give acceptable result.
What I know is that this lens have m39 mount and is for half frame camera.
Others have done it to 4/3, but can we?

02-07-2011, 01:15 AM   #2
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AFAIK there are no M39 adapters for Pentax available new.
A while ago I searched for this, but found none.
Perhaps you are lucky to find a used one?

Or someone else here knows a source?
02-07-2011, 02:07 AM   #3
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There's M39 to PK adapter, I've seen it on fleabay, like this.
Or, maybe, do it the long way: M39 - M42 plus M42 to K

But people with 4/3 bodies should perform minimal modification to the lens in order to get infinity focus, I don't know whether we should do it too.

Well, maybe this endeavor is more an adventure than invention, but still interesting..

02-07-2011, 03:38 AM   #4
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No way to get infinity focus with any DSLR that has a mirror. The flange distance is a lot shorter than what conventional SLRs have.

02-07-2011, 05:05 AM   #5
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brkl has it right. M39-M42 adapter rings are ultra-cheap. M39-PK adapters aren't very expensive. But that Industar is L39/LTM (Leica thread mount) -- same threads, different flange focal length a.k.a. register. A short register lens (LTM is ~29mm) put onto a longer register mount (Pentax is ~45.5mm) can't focus to infinity without chopping off the difference from the lens. Do you feel like surgically removing 16.5mm from the lens body? If not, you'll have a very nice closeup/macro lens that's useless for general photography. Sorry.
02-07-2011, 10:21 AM   #6
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It looks cool though
02-07-2011, 11:22 AM   #7
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QuoteOriginally posted by brkl Quote
No way to get infinity focus with any DSLR that has a mirror. The flange distance is a lot shorter than what conventional SLRs have.
QuoteOriginally posted by RioRico Quote
brkl has it right. M39-M42 adapter rings are ultra-cheap. M39-PK adapters aren't very expensive. But that Industar is L39/LTM (Leica thread mount) -- same threads, different flange focal length a.k.a. register. A short register lens (LTM is ~29mm) put onto a longer register mount (Pentax is ~45.5mm) can't focus to infinity without chopping off the difference from the lens. Do you feel like surgically removing 16.5mm from the lens body? If not, you'll have a very nice closeup/macro lens that's useless for general photography. Sorry.
This is what I said to be an adventure
For starter, see this. No chopping involved, if I see it correctly.
02-07-2011, 10:58 PM   #8
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The good news is that yes, you can get an M39 to M42 adapter.

The bad news is that two types of FSU lenses are available in M39 mount. Most are Leica Thread Mount (LTM) and were made for use on rangefinder camera. The rest were made for early Zenit SLR cameras. The Zenit lens can be adapted to your Pentax and will retain infinity focus. The LTM lenses can not. The Industar pictured does not fall into that category. I also suspect that it may not have adequate image circle for FF 35mm.


Steve

02-08-2011, 04:08 AM   #9
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QuoteOriginally posted by minahasa Quote
For starter, see this. No chopping involved, if I see it correctly.
No chopping, but that's for a short-register m4/3 camera. An LTM lens can be mounted, WITH INFINITY FOCUS, on these bodies: Pentax A110 (27mm), Samsung NX (25.5mm), m4/3 (20mm), and Sony NX (18mm). It could probably be finessed to fit on an old Olympus Pen-F half-frame body (28.95mm). For anything else without surgery, it's closeups only. YACL: yet another closeup lens. Bother.

In case anyone is interested, here is my taxonomy of 39mm-thread lenses:

* LTM: Leica 39mm thread and 28.8mm register. Zillions of rangefinder lenses are LTM. As I mentioned, these can be adapted to shorter-register mounts, but on Pentax SLRs they're only usable for closeups/macros - no infinity focus. Bother.

* M39: Leica 39mm thread with Pentax 45.46mm register. Several FSU (former SovUnion) lenses are M39. Mine include Industar-50, Jupiter-9, Jupiter-11. Slip on a cheap M39-M42 or almost-as-cheap M39-PK adapter, and you're ready to go.

* L39: Leica 39mm thread but no focusing mechanism, thus no register. These are mostly enlarger (EL) or bellows-macro lenses. But many older USA-made EL's have other threads: 29-30-34-38mm or non-metric. Confusion and hilarity ensue.

I am sorely tempted to get a NEX, if only to be able to mount LTM's and maybe some cheap C-mount glass (register= 17.526mm). And lenses from Konica, Minolta, Miranda, Canon, Fujica, etc. Or maybe that would be an admission that I'm a total slave to LBA and am doomed forever. What, 200 lenses ain't enough? Let's try for 300, 500, 1500 lenses! And more! You can never have too many lenses! HaHaHaHaHa... [/me gets strapped into straightjacket by LBA police]
02-08-2011, 08:10 AM   #10
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Interesting taxonomy RioRico, though you are at odds somewhat with common usage and for what it is worth, common usage is a mess. My taxonomy goes like this:

M39 = Any lens with 39mm diameter thread mount

LTM = Leica Thread Mount lenses with 28.8mm registration, 1/26" thread pitch, and focus mechanism

LSM = Leica Screw Mount...same as LTM

M39 (Early) = LTM with variable registration between cameras, even within a particularly brand/model

M39 (Canon J) = Like LTM, but with 1/24" pitch, relatively rare

M39 (Braun) = Like LTM, but with different registration distance for Braun Paxette

M39 (Zenit) = Like LTM, but with 45mm registration for 35mm SLR use. Also ZM39.

M39 (Great Wall) = Like LTM, but with registration distance for Great Wall medium format (!) camera.

M39 (fixed) = lenses without focus mechanism and having various registrations. This would include bellows, enlarger, and process lenses. To confuse matters further, these are commonly called LTM or L39 within the trade.

Other variations anyone?


Steve
02-08-2011, 04:06 PM   #11
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Yep, no infinity.

But for fun, Industar 69 28mm f2.8::Manual Focus Lenses
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