Canon 50mm 1.8 LTM - Oil/haze/SomethingThatShouldn'tbeThere on front elements

[Tijmendal]

Hi,

I too have problems with my 50mm (annoying!), but unlike most others, the substance is on the front elements (in front of the aperture). There' quite some instructions floating around on the web on how to disassemble the lens, but only up to the part of clean the rear elements. I was wondering if anyone could help me out by describing (with pictures would be incredible of course!) how to get to the front elements.
I did remove the retainer ring on the front of the lens, but that gives me access only to the very first element, not anyone of the ones behind it. Too bad.

Thanks!

 

[Mackinaw]

Which version of the lens? All chrome? Or black and chrome?

Jim B.

 

[Tijmendal]

Which version of the lens? All chrome? Or black and chrome?

Jim B.

It's the black and chrome one.

 

[Tijmendal]

Am I allowed to bump this? I'm doing it anyway. Muahaha!
Still looking to get rid of that stuff, but I've got no clue how to access the front elements...

 

[kuuan]

sorry I can't help much but two observations:
- see the disassembly of the 1.4/50: https://www.youtube.com/watch?v=qMRnqIysGAk same as with the f1.8 unscrewing the 'name ring' would give access to the front element only. To take out the whole front group he unscrewed the outer ring incl. the aperture ring. However to do that he first took off a tiny screw on the side of the lens which I believe the 1.8 doesn't have.
- have a look at the lens scheme: http://www.canon.com/camera-museum/lens/s/data/50-85/s_sere_50_18v1.html?p=2 the second groups seems to exist of two cemented elements. If the fault is there the fault possibly is in the cementing, and to repair they would need re-cementing which would be quite a challenge.
and: There are many Canon LTM 1.8/50s around that have haze in the second to rear glass. In case yours proves impossible to repair best try to get one with the etched rear glass for cheap and install your clean rear group in it. ( I'd have such a lens, but most liely it would only be in August that I get where the lens is to send it )

 

[Peter Jennings]

I've disassembled three or four of the black barrel f/1.8s and there were variations in construction just in that small sample set. Canon seemed to change their design often. I second kuuan's suggestion about getting one with the more common haze/corrosion behind the aperture and swapping elements. Or better yet, sell yours to someone who needs a clean rear element group and just buy a new one in good working condition.
I got a nice Canon P and an L1 with infected lenses. The cameras were in excellent condition but I no longer have the lenses.

 

[Fixcinater]

Any update?