KEH ugly lenses

[dslater]

Hi all,
I just bought an ugly Leica 90mm f/2.8 Elmarit from KEH the other day. When I called them up befoer buying the lens I asked them about it and was told it was only good for parts. After reading many threads here, I decided to take a chance and buy the lens - I figured worst case, I could return it and get the bargain grade lens.
Anyway, the lens arrived and it's quite good. The barrel looks very good. The glass is not perfect, There's definitely marks on the inside of the lens elements, but I think the only effect would be to reduce contrast a bit.
It looks to me like if I could take the lens apart, I could clean up the elements quite a bit. Does anyone know what is involved in taking this lens apart? Is it something that's doable or is it best left to a professional?

Dan

 

[Sparky]

I don't want to be RESPONSIBLE for what happens if you take it apart - but I've taken a few zeiss and nikkor lenses (medium and 35mm format) apart - and really haven't had any problems. Just try to be really aware what you're doing at each point - and especially pay attention to orientations of things you remove. Taking a digital shot of each stage of disassembly would be good.

 

[dslater]

I don't want to be RESPONSIBLE for what happens if you take it apart - but I've taken a few zeiss and nikkor lenses (medium and 35mm format) apart - and really haven't had any problems. Just try to be really aware what you're doing at each point - and especially pay attention to orientations of things you remove. Taking a digital shot of each stage of disassembly would be good.

Yes - well I don't really need to take the whole lens apart - just need to get the front element group out so I can get at the inside surfaces. I actually started this - took off the front retaining ring, but when the front element refused to come out, I gave up and put the retaining ring back in.

 

[Sparky]

My guess is that you'll need to get your hands on a 'lens wrench' and remove the first retaining ring holding that group in place... at which point it will either unscrew or just pop/fall out.

 

[dslater]

My guess is that you'll need to get your hands on a 'lens wrench' and remove the first retaining ring holding that group in place... at which point it will either unscrew or just pop/fall out.

I have a lens wrench and I did remove the first retaining ring, but the lens group wouldn't come out. One thing about this lens is that the diaphragm is right behind the first element so I suspect that first group is attached to the diaphragm and getting it out would involve removing the diaphragm ring.

 

[Sparky]

Hi - no - I can't see the design being that poorly considered. At this point - you'll have to use a bit of elbow grease and start unscrewing the first group. Look for some sort of means of doing this. Make up a tool if you have to - be creative. It would be downright silly to attach the first group to the shutter or aperture. I'm SURE that's the case.

 

[dslater]

Hi - no - I can't see the design being that poorly considered. At this point - you'll have to use a bit of elbow grease and start unscrewing the first group. Look for some sort of means of doing this. Make up a tool if you have to - be creative. It would be downright silly to attach the first group to the shutter or aperture. I'm SURE that's the case.

That's the thing - there is nothing to unscrew - once the retaining ring came off, all that was there was the front element and the lens barrel - this isn't an LF lens - it's a 35mm lens. I don't think the front element is actually attached to the diaphragm. I think what is going on is that if I unscrew the screws holding the aperture ring on and take it off, I may find that the front of the lens barrel comes off and release the front element.
I was hoping that with this post I'd be able to find someone who has actually taken one of these lenses apart before.

 

[Sparky]

I found with the other lenses there was a gap between the 'barrel' and the front group - and that I had to use a grommet about the size of the diameter of the front element 'frame' to unscrew the front group. There were no lens wrech grip points or anything like that - but I'd bet your lens, dollars to doughnoughts is pretty similar.

 

[Sparky]

maybe you can post a little pic (or a big one!) of what it looks like without the retaining ring...?

 

[Marcust101]

I've used a rubber bung to get purchase on a element like that. It grips the glass with out marking it. Worth a go though you need to be careful not to over tighten putting it back in

 

[Rollei fan]

I have taken apart some lenses, and the dirt or haze in them was only on the elements nearest to the aperture, i.e. the innermost surfaces facing the aperture. The lens groups themselves should not be dismantled by an amateur or you may well ruin the lens.

 

[Venchka]

I bought a 90/2.8 Elmarit (1965) last year. The lens came with a receipt from Sherry Krauter at Golden Touch for a CLA. Cost: $65. Sherry's reputation is above reproach. Peace of mind and knowing the job was done right was worth more than $65 to me.

 

[Rolleiflexible]

I bought a 90/2.8 Elmarit (1965) last year. The lens came with a receipt from Sherry Krauter at Golden Touch for a CLA. Cost: $65. Sherry's reputation is above reproach. Peace of mind and knowing the job was done right was worth more than $65 to me.

I echo this recommendation. I bought a nickel Summar off eBay recently and while it had no scratches, it had tons of internal haze -- so much so, that the local Leica repair folks said it was beyond hope. I sent it to Sherry. Three weeks later I got back a lens that looks new. Total cost: $95 plus shipping. Sherry is a magician when it comes to reviving Leica glass. If it can't be fixed, she will tell you so and send it back at no cost.

RFXB

 

[dslater]

Thanks for the info - i'll probably give her a try.

Dan

 

[Jim Noel]

I give up. What is a "rubber bung?"

Is it a suction cup?

 

[dslater]

I give up. What is a "rubber bung?"

Is it a suction cup?

I think it's a rubber cork

 

[John Koehrer]

I think it's a rubber cork

Yep, fer sure it is that.
Ace should have them. Or Scientific Surplus on line.