w3rk5
Well-known
Hi. Does anyone know the filter size I should use on this Industar 50? Thanks.
DaveP
Well-known
Dont know the screw size but the 36mm push ons fit..........
Jocko
Off With The Pixies
I think it takes 36mm screw-ins too - the Zorki 6 manual (http://www.zenit.istra.ru/mans/zorki-6/zorki-6-eng.html) would seem to imply this.
Nickfed
Well-known
Jocko said:I think it takes 36mm screw-ins too - the Zorki 6 manual (http://www.zenit.istra.ru/mans/zorki-6/zorki-6-eng.html) would seem to imply this.
There's no way it can possibly be 36mm screw-in. The clamp-on is 36mm, the same as Leitz but the 34mm Leitz screw-in filter is too big for the I-50. I submit that the screw will be 33mm.
I suspect these will be very rare, possibly unique to the I-50. You may have better luck getting an old 36mm push-on with loose glass system. That is what I used.
w3rk5
Well-known
Thank you everyone for the quick reply. I think I might be 33mm. I'll let you guys know for sure. I'm gonna look for a 33mm on *bay. Thanks again.
John Robertson
Well-known
Confirm A36 push on or clamp on, 33mm screw in. 33 is nearly impossible to find, I have a lens hood and a UV both are Heliopan, but I bought them years ago!!!
w3rk5
Well-known
Thanks John. I think I'll get a 33-37mm step up adapter.
Nickfed
Well-known
I wouldn't bet on getting a 33mm anything, but if if you have a choice, a 33 > 40.5 wouldn't be a bad idea. The latter is a common size for FSU lenses, and a lot of others.
w3rk5
Well-known
I found this on *bay. If they had a 33 to 40.5 I'd get that one for sure. I already have a 40.5mm hood and filters.
http://search.ebay.com/search/searc...om=R8&satitle=33mm+step+up+adapter&category0=
http://search.ebay.com/search/searc...om=R8&satitle=33mm+step+up+adapter&category0=
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Nickfed
Well-known
I' m amazed. I didn't think you would find anything in 33mm.
Ain't eBay just wunnerful??
Ain't eBay just wunnerful??
peterc
Heretic
My Zorki 4K manual says the thread on the I-50 is 35.5mm.
The pushon size for lens shade is 37mm.
Peter
The pushon size for lens shade is 37mm.
Peter
Nickfed
Well-known
Hmmm
Must be a different I-50 from that shown.
Must be a different I-50 from that shown.
w3rk5
Well-known
Well, I ordered the step up ring adapter (33mm-37mm). I'll keep you guys updated when I get it. I hope it's 33mm. 
Nickfed
Well-known
I think you will be OK. I assume yours is a Z-6, and the I-50 in the picture looks just like the one on my 1961 Z-6, so you can bet your balls it isn't 35.5mm. As I said, the 34mm I use on the Summar is too big.
Good luck and I hope you find some 37s to suit OK.
Good luck and I hope you find some 37s to suit OK.
w3rk5
Well-known
LOL! Thanks again everyone.
John Robertson
Well-known
I have attached an extract from the KMZ archive site which should settle any differences. The 50-2 lens is the much later one with the "flat" front.
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Nickfed
Well-known
A new star in the RF firmament, perhaps...
I always understood the I-50-2 was M42 for Zenit but I have never actually seen one.
I always understood the I-50-2 was M42 for Zenit but I have never actually seen one.
w3rk5
Well-known
Thanks for the post John Robertson. I guess I really can "bet my balls" that it's a 33mm. 
Moriarty
Newbie
There are different thread sizes on I-50s. I have 3 of them. The one with serial number 7546831 has a front thread that's a little bit bigger then 34mm TLR thread, 7322816 and 7118056 has a thread size smaller than 34mm.
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w3rk5
Well-known
The screw on filter size for the I-50 (rigid) is 33mm.
Thanks for everyones help. I'll attach a pic later on.
Here it is.
Here it is.
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