Dismantling Jupiter 11

cardiff_gareth

cardiff_gareth

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So after buying a Zorki 4K, someone in my village said I've got one for sale so now I have 2! This camera came with the viewfinder attachment for the telephoto lens and the lens itself. They hadn't been used for years but amazingly there was no fungus in either lens.

The only issue I have is the Jupiter 11, you can barely move the focusing, I think the old grease has hardened in the focusing rails.

Is it a case of removing the 3 grub screws (one shown in pic 2) and then unscrew the top of the lens away from the bottom, or is there more to it than that?

Also, is there a preferred grease? I was going to get some copper grease?

Thanks
 

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Nice. I can only speak from my own experience, but once you've taken a lens apart you might get it back together, but working properly is another matter.
 
Carl Zeiss focusing helicals have multiple starting points for the threads. If you dismantle such a lens and then reassemble with the wrong starting point you will never get infinity focus.
 
Ah!

I've dismantled a few lenses before to fix fungus so just a case of removing the optics but stiff focusing was a new one on me. I'll take a look to see how much a service is and if not, bite the bullet and give it a go. It's unusable right now so nothing to lose I say!
 
cardiff_gareth said:
Also, is there a preferred grease? I was going to get some copper grease?
Click to expand...
I have used white "food grade grease" (it is available in smaller containers under that use).
It does not go hard, and the oil does not separate out with time.

It is also ideal doe more modern lenses when one surface is plastic and one metal.

It is also perfect for plastic and metal gears and plastic to metal sliding surfaces on other household appliances.

I would not use copper grease, copaslip etc, it does harden, and the oil does separate out as it does with most moly greases.
 
john.margetts said:
Carl Zeiss focusing helicals have multiple starting points for the threads. If you dismantle such a lens and then reassemble with the wrong starting point you will never get infinity focus.
Click to expand...
Read somewhere that before taking bits apart, put a dot on each of the parts so you can match them up again. Also a trick I read about, use a large egg box to put the various bits in, in the correct order, then work backwards...

But, I've never tried anything quite so brave!
 
That video is grand and I can see how it comes part now. Good tip with the dots to line everything back up again. The unscrewing of the 2 parts is weird as once the bottom comes away from the top, the bottom is a hollow metal tube, like a spacer and all the optic are in the top half.

Food grade grease. I was hoping that was something I could pick up locally like in Screwfix but I don't seem to be able to find it for sale in small quantities. Any help where to look would be gratefully received ;)
 
The jar I have in the drawer has no label, but it came in a tube like sealer used in guns.
I have also used this https://www.ebay.co.uk/itm/323090646233 when the parts are only metal (I don't see why it won't work if some are plastic)

Whatever grease you use, if you can see it, there is too much :)
 
I've only taken one lens apart a 35mm maybe pentax? screw fitting. never again! I got it apart and back together and it works fine... but putting the iris rings and blades back together.. well I've still got the samaritans on speed dial!
Good luck.
 
cardiff_gareth said:
Food grade grease. I was hoping that was something I could pick up locally like in Screwfix but I don't seem to be able to find it for sale in small quantities. Any help where to look would be gratefully received ;)
Click to expand...
Vigo stock it.
 
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