Where to get a replacement aperture bearing for CV 35/1.7

M

Mephiloco

Well-known
Local time
2:42 PM
Joined
Apr 26, 2009
Messages
515
I was doing a small repair on my ultron 35/1.7 and have lost the aperture bearing (so that it clicks on fstops) due to my dog jumping on the bed while I was working. I can't find anything online about it, and don't know where to go to find bearings this size.

Anyone have any suggestions? I'd rather not send it to DAG for a few months just for him to put in a ball bearing and charge me $50+.
 
Mephiloco said:
I was doing a small repair on my ultron 35/1.7 and have lost the aperture bearing (so that it clicks on fstops) due to my dog jumping on the bed while I was working. I can't find anything online about it, and don't know where to go to find bearings this size.

Anyone have any suggestions?
Click to expand...

1. Shoot the dog.
2. Work on a proper bench, not on your bed.
3. Suck it up and send it for repair. Quite probably DAG or CV don't have beds or dogs in their workrooms.
 
Thanks for the less than helpful advice. I'd sooner use the otherwise now fixed lens without click stops than be without it for 4+ months just to pay for a bearing and less than 5 minutes of labor.
 
I don't know where to get the ball bearing for that particular lens, but I lost (dropped in carpet!) the tiny ball bearing that does the same job when I was putting my E-Rokkor 50/4.5 back together. I ended up tearing a ball-point pen to bits and stealing the ball out of the nib (washed the ink off first :p). It's a little small, so slightly looser, but it gives me the clicks in the dark I need.

If it were me I'd figure out approximate diameter then go to a bearing shop and buy some in different sizes. They're very cheap, when I rebuild motorbike steering heads you normally get 35-45 at once, much bigger, and it's not normally much more than $20 or so.

I don't know what sort of places you have over there but in NZ we have lots of Saeco outlets; they can order in all sorts of stuff, I'd absolutely bet that they'd have bearings down to that size.
 
Worked perfect for me. The pen roller is a little smaller than the original bearing, but it clicks fine, a little softer than it used to (as was your experience), but now the aperture ring on my 35/1.7 matches the action on my 35/2.5 almost exactly.

All in all the operation was a success... Focus is no longer stiff, front section is no longer wobbly, and I have aperture clicks. Now if I could just find a new front plate for the lens and it'd be as good as new :)

Thanks for your help xwhatsit.


xwhatsit said:
I don't know where to get the ball bearing for that particular lens, but I lost (dropped in carpet!) the tiny ball bearing that does the same job when I was putting my E-Rokkor 50/4.5 back together. I ended up tearing a ball-point pen to bits and stealing the ball out of the nib (washed the ink off first :p). It's a little small, so slightly looser, but it gives me the clicks in the dark I need.

If it were me I'd figure out approximate diameter then go to a bearing shop and buy some in different sizes. They're very cheap, when I rebuild motorbike steering heads you normally get 35-45 at once, much bigger, and it's not normally much more than $20 or so.

I don't know what sort of places you have over there but in NZ we have lots of Saeco outlets; they can order in all sorts of stuff, I'd absolutely bet that they'd have bearings down to that size.
Click to expand...
 
Micro Tools for the bearings, a magnet on a piece of steel as a bearing sweeper for the carpet. The ones at the hardware are about 18" wide, I just use a steel rule & rare earth magnet.
 
Landshark said:
Micro Tools for the bearings, a magnet on a piece of steel as a bearing sweeper for the carpet. The ones at the hardware are about 18" wide, I just use a steel rule & rare earth magnet.
Click to expand...

That was what I was going to suggest, but it doesn't always work. I was working on a 65mm Mamiya MF lens once, on my kitchen table. I knew better, but did it anyway. I lost control of the screw (naturally) and watched it roll across the glass and disappear towards the floor. I spent a great deal of time over the next couple of days with flashlights and a good magnet. Alas, no luck. I tried for three days at different times. Even my wife looked for me.

Two weeks later, when I found the darn thing, quite by accident, stuck in the persian rug fibers, I couldn't believe the fibers had been able to hold it agains the magnet. I got the magnet and tried it, only to discover the screw was made of brass. :bang: :bang:
 
Well, the reason I was working on the lens over my bed was because my floors are all hardwood, as is my desk that I usually do work on. Any screw or bearing is going to fall, bounce, and never be found again. I'm going to go track down some bearings for replacement later and keep them around in case I have to do some more smaller repairs. The Ultron actually clicks more like my summarit now, which I kinda like. Glad I saved the money i would've spent sending it to a real repair person
 
Work in a box.

viso.JPG
 
vacuum all the room, run a strong magnet over the contents of the vacuum, an old hi-fi speaker is good source for the magnet

obviously I'm not speaking from experience here
 
You must log in or register to reply here.
Back
Top Bottom