Bad Jupiter 36b

blotafton · Joined: 08 Aug 2013 Posts: 1506 Location: Sweden

Hello
first post!

I recently made a not so good purchase of a J-36b, Pentacon mount, the one with white text for about 50$
And it's a beautiful lens, a rather heafty one at that. Externally it looks more or less perfect, but it has serious problems. First of all the rear lens element closest to the mount has large drops deposited on the inside of it. I've seen similar thing before but never such large accumulations of liquid.

And that's not all. I think the aperture action is broken. This is my first Kiev lens so I may have simply failed to understand how it works. The little pin in the mount that can move in and out does absolutly nothing, are the aperture blades supposed to move when I press it?

Looking closely at the lens there are clear evinence that someone have tampered with it before, perhaps tried to clean or repair it.
What I'd like to know is if this would be a complicated repair, for someone who has little experience in such matters. Also are there any scematics or repair guids online? Otherwise it's a paperwheigt like no other Smile

themoleman342 · Expire: 2013-01-24

Does the aperture stop down manually as you turn the ring? The pin is supposed to open it up when it is stopped down. It's the way the auto feature worked on Kiev and Pentacon cameras.

A common problem with the Jupiter (and a few others like the Vega 12) is the piece that transfers the downwards motion of the pin to the sidewards motion that slides the aperture closed, has become nonworking. Sometimes it falls out of the notch that it's supposed to sit in. The mechanism really does require precision to work well, which most are lacking. If it's been taken apart there's no telling what the person did.

As far as the droplets, the back elements drops right out if you can undo the retaining ring in back. Simple cleaning.

blotafton · Joined: 08 Aug 2013 Posts: 1506 Location: Sweden

I figured it wouldn't be that easy.
The aperture seems to be stuck wide open, neither turning the ring nor pressing the pin has any effect. Well I've been thinking of getting the necessary spanner tool anyway, so I might at least be able to fix that issue.

themoleman342 · Expire: 2013-01-24

If nothing is moving, than the most likely culprit is oil on the blades. The spring usually can not overcome the resistance.

iangreenhalgh1 · Expire: 2014-01-07

Russian lenses are simply but sturdily constructed, I've yet to see one that had an aperture that was broken, so I agree, it's probably just oil on the blades. Good luck. Smile

blotafton · Joined: 08 Aug 2013 Posts: 1506 Location: Sweden

Thanks for your assessments. I promise to post some pictures if I'm successful Smile

themoleman342 · Expire: 2013-01-24

Well, it's not Russian.

I've seen a few of these Arsenal lenses that have truly been broken. Have you repaired many Mir 45s, Jupiter 36s, Kaleinar 3s, and Vega 12s Ian? They all use a mechanism that is great when working but is pretty weak overall.

iangreenhalgh1 · Expire: 2014-01-07

Alright, Ukranian then.

Like I said, never had a broken one so why would I have repaired one? Quite the opposite of CZJ lenses, which frequently have broken apertures.