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Advice on focussing : Industar 50mm f3.5 on Sony A6000
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PostPosted: Sat Aug 17, 2019 9:06 pm    Post subject: Advice on focussing : Industar 50mm f3.5 on Sony A6000 Reply with quote

Hi All

Today I bought a beautiful little silver Industar 50mm f3.5 lens attached to a Zenit 3M. The serial number implies it is a 1964 vintage. It is in a Leica L39 thread.

The issue I have is it will not focus at all on my Sony A6000 with a Kecay L39 M39 to Sony Nex adapter

The adapter works fine with my Industar И-61 53mm f2.8 and also on my late fathers Leica summicron 5cm f2 collapsible lens.

If I look through the viewfinder of the Zenit 3M with the Industar 50mm f3.5 attached I can focus OK.

Any ideas on what I need to do to make the lens work ?

I love my Industar И-61 and I am really excited about using the 50mm

Thank you in anticipation of your help


PostPosted: Sat Aug 17, 2019 9:25 pm    Post subject: Reply with quote

The Zenit 3m has an (almost) identical back-focus to a generic M42 slr, so what you need is a 39-42mm converter ring, (available on eBay for very little money), then use that assembly on an M42 adaptor. According to some references, the Zenit 3m back-focus distance is slightly different to the conventional Pentax/Praktica etc. M42 distance, but I've not noticed any problem. Having said that, I've probably never tried to focus it at infinity on my Pentax with the aperture wide open Wink

The Zenit 3m was my first slr back in '69. When I sold it I let the Industar-50 lens go with it, but bought another soon after, it's a lovely lens Smile

You may care to note, the Industar-50-2 is the M42 version, has no focus problems and works without any intervening ring, just needing an M42 adaptor for whatever body you're using.

The Industar-50 was also available in M39 rangefinder mount (Leica screw mount), it looks much like the lens you've got but with a built-in extension tube. There was also a collapsible Industar-50 in M-39 rangefinder mount. Be careful with these, they can "collapse" too far into a modern mirrorless body and cause damage, or at least chipped paint. All versions of the Industar-50 are Tessar derivatives, not Elmar as you might see mentioned. The three examples I have all appear to be coated, they certainly perform very well!

Enjoy Smile


PostPosted: Sat Aug 17, 2019 10:07 pm    Post subject: Reply with quote

kypfer wrote:
The Zenit 3m has an (almost) identical back-focus to a generic M42 slr, so what you need is a 39-42mm converter ring, (available on eBay for very little money), then use that assembly on an M42 adaptor. According to some references, the Zenit 3m back-focus distance is slightly different to the conventional Pentax/Praktica etc. M42 distance, but I've not noticed any problem. Having said that, I've probably never tried to focus it at infinity on my Pentax with the aperture wide open Wink

The Zenit 3m was my first slr back in '69. When I sold it I let the Industar-50 lens go with it, but bought another soon after, it's a lovely lens Smile

You may care to note, the Industar-50-2 is the M42 version, has no focus problems and works without any intervening ring, just needing an M42 adaptor for whatever body you're using.

The Industar-50 was also available in M39 rangefinder mount (Leica screw mount), it looks much like the lens you've got but with a built-in extension tube. There was also a collapsible Industar-50 in M-39 rangefinder mount. Be careful with these, they can "collapse" too far into a modern mirrorless body and cause damage, or at least chipped paint. All versions of the Industar-50 are Tessar derivatives, not Elmar as you might see mentioned. The three examples I have all appear to be coated, they certainly perform very well!

Enjoy Smile



kypfer

Thank you for the excellent feedback , I've just found a 39-42mm adapter on Amazon for 5-90 GBP , so I am going to order it now Wink

I will post some results here when I have took some photos

Thank you once again

Like 1 small


PostPosted: Sun Aug 18, 2019 2:46 am    Post subject: Reply with quote

I use the following set: industar from Zenit-3M + macro ring M39 h=16.4 mm + M39-NEX adapter + sony a7.


PostPosted: Sun Aug 18, 2019 12:24 pm    Post subject: Reply with quote

With a bit of luck the m39-m42 adapter will work. But if it was a good day in the factory when the Industar was made and it's up to specs it will not reach infinity, but almost.

sergtum has good advice, I have this solution too and recently I have changed to a helicoid adapter to gain macro ability and smoother focusing.

I had a Mir 1 that worked with a m39-m42 adapter. Then I got a better Mir 1 and a Jupiter 11 that could not reach infinity that way.


PostPosted: Sun Aug 18, 2019 8:06 pm    Post subject: Reply with quote

sergtum wrote:
I use the following set: industar from Zenit-3M + macro ring M39 h=16.4 mm + M39-NEX adapter + sony a7.


thank you sergtum, I jumped in with for the m39-m42 adapter as I did not see your reply, I've since seen you solution on another forum .

Thank you for your feedback

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PostPosted: Sun Aug 18, 2019 8:09 pm    Post subject: Reply with quote

blotafton wrote:
With a bit of luck the m39-m42 adapter will work. But if it was a good day in the factory when the Industar was made and it's up to specs it will not reach infinity, but almost.

sergtum has good advice, I have this solution too and recently I have changed to a helicoid adapter to gain macro ability and smoother focusing.

I had a Mir 1 that worked with a m39-m42 adapter. Then I got a better Mir 1 and a Jupiter 11 that could not reach infinity that way.


blotafton , thank you , I love my 50mm lenses for portrait and street photography, so not quite getting to infinity may not be an issue.

I love how people on this forum are so helpful Smile

Like 1 small


PostPosted: Tue Aug 20, 2019 2:47 am    Post subject: Reply with quote

I have quite a few m39 lenses and always had trouble hitting infinity using an m42-nex adapter and m39-m42 adapter.

I noticed there was a ridge on the threaded m42 insert of the m42 to nex adapter which I considered machining down to be able to hit infinity. Instead I looked around until I could find the cheapest junk adapter that didn’t have this ridge. Now using this cheap adapter with the wrong register distance for m42 lenses, I am able to hit infinity with the modified m39 lenses. Just one way to get around it.

I would post pictures of the two adapters but I guess that won’t work on mobile. If you look at the k&f m42 to Nex adapter you will see a ridge on the shiny m42 insert, some of the super cheap adapters do not have this ridge and are flush with the main adapter body... this gives you a little more room to hit infinity and worked for me on the a6000 and A7ii. If you still needed it a little closer to hit infinity you could mill down the m42 face of the adapter further. The cheap adapter that worked for me is sold under the name dollice... it may not work for you but just an option..

Andrew


PostPosted: Mon Aug 26, 2019 11:18 pm    Post subject: Reply with quote

Mr.Bittacy wrote:
I have quite a few m39 lenses and always had trouble hitting infinity using an m42-nex adapter and m39-m42 adapter.

I noticed there was a ridge on the threaded m42 insert of the m42 to nex adapter which I considered machining down to be able to hit infinity. Instead I looked around until I could find the cheapest junk adapter that didn’t have this ridge. Now using this cheap adapter with the wrong register distance for m42 lenses, I am able to hit infinity with the modified m39 lenses. Just one way to get around it.

I would post pictures of the two adapters but I guess that won’t work on mobile. If you look at the k&f m42 to Nex adapter you will see a ridge on the shiny m42 insert, some of the super cheap adapters do not have this ridge and are flush with the main adapter body... this gives you a little more room to hit infinity and worked for me on the a6000 and A7ii. If you still needed it a little closer to hit infinity you could mill down the m42 face of the adapter further. The cheap adapter that worked for me is sold under the name dollice... it may not work for you but just an option..

Andrew


Andrew thanks for your help, I am pleased to report the lens focusses to infinity

Like 1 small


PostPosted: Tue Aug 27, 2019 8:11 am    Post subject: Reply with quote

kypfer wrote:


The Industar-50 was also available in M39 rangefinder mount (Leica screw mount), it looks much like the lens you've got but with a built-in extension tube. There was also a collapsible Industar-50 in M-39 rangefinder mount. Be careful with these, they can "collapse" too far into a modern mirrorless body and cause damage, or at least chipped paint. All versions of the Industar-50 are Tessar derivatives, not Elmar as you might see mentioned. The three examples I have all appear to be coated, they certainly perform very well!

Enjoy Smile


I have one of the collapsible models, I added a couple of o-rings to the tube to prevent it going too far back.
Though I've now added an extension tube to it - so it focuses to infinity without sliding it out. This gives the ability to slide it out when I want closer focusing as the MFD is rather long with this lens in standard format.