Industar 22 stiff aperture

[CDT]

I picked up my first FSU lens. Looks good, but the aperture has a habit of getting frozen in postion. It will loosen up after about 15 minutes of constant action, but when as I put it down for an hour it freezes up (at 70F). I'm guessing this is some sort of soviet super grease.

Will it loosen it eventually by working the aperture or does it need to be taken apart and cleaned up? My figure tips are just about worn off.

Thanks,
Chris

 

[rolleistef]

I'm afraid not. I had the same pb w/ an Oreston 1.8/50 and the only possible way to fix it was to dismantle the lens and clean the blades with petrol. Good nite, and good luck!

 

[fidget]

My similar lens had a very stiff aperture control. It was old grease between the cylinders which you rotate to change aperture. Fairly straightforward job to do:
http://jay.fedka.com/index_files/Page325.htm
I had a problem when I stripped it too far.

Dave...

 

[ZorkiKat]

Try this trick first before disassembling the lens.

Make a 50% lighterfluid + 50% 3-in-1 oil (or sewing machine oil) mixture. Very little is needed. Draw this mixture in a small syringe.

Through the needle of the syringe, introduce this oil mixture through the crevice between the aperture ring and the lens fascia (where the lens ID is engraved). Use very little amounts, and 'pump' in the oil very slowly. DO NOT flood.

Try to turn the aperture ring after each bit of application. Usually, some improvement can be observed soon after the first application. Wait for the oil to seep in. Once the aperture ring is freed, oiling is done.

Be careful not to put oil on the lens, or on the space between the aperture ring and the lens ring.

Often this would do the job, without further disassembly.

Jay

 

[CDT]

Thanks all. I'll give it a try.

 

[Valkir1987]

I'm having the same problem with my collapsible I-22, and I wan't to disamble it. But I came no further than removing the focus ring, and the two tiny screws on the tube. I try to screw off the front ring, but the aperture ring seems to hold it in its place. I've read both the discription on Jay's site and the page in Maizenberg's book, but i'm still puzzeling how to take it apart. Can anyone tell me how I should take it apart whith no further problems...?

Greetings

 

[ZorkiKat]

I'm having the same problem with my collapsible I-22, and I wan't to disamble it. But I came no further than removing the focus ring, and the two tiny screws on the tube. I try to screw off the front ring, but the aperture ring seems to hold it in its place. I've read both the discription on Jay's site and the page in Maizenberg's book, but i'm still puzzeling how to take it apart. Can anyone tell me how I should take it apart whith no further problems...?

Greetings

If you look at the rim of the lens front ring, there is a tiny hole which is used to access an even tinier screw which locks the front ring in place. You need to loosen this screw to be able to remove the ring entirely. A 1-mm screw driver is needed for this grub/setscrew. Try not to remove this screw, but it will likely fall off. Putting it back can be a pain, and needs to be done to fix the front ring in place.

Jay

 

[Valkir1987]

Thanks for your quick reply
I'd already found the tiny screw, and tried to screw the front of the lens off. But it would only screw to a certain point. The front ring screws untill the aperture ring prevents it from further screwing. I've also removed the middle screw of the tube.

Quote from Maizenberg:

"Page 130" The Industar -22 lens design is similar to the disign of the Industar -10 lens. The shape of the diaphragm tang and the disassembly order are slightly different. To remove the block from the mount, do not siassamble the mound and do not unscrew the exterior ring. It is sufficient to unscrew just the fastening nut. (and the screw 4)

I'm yet testing the lens with my Zorki 1, I hope to get the prints soon.