cleaning a collapsible 90 - how do i do it?

Kim Coxon said:
If you take a set of pics as you do it and explain what you did, I can turn it into a PDF file like I did with Brian Sweeney J3 thread and add it to the list for all to share!

Kim
Click to expand...


now that could be ugly...you have clearly never seen me work.
 
Joe, it might sound difficult but it is not. There is no grip on any ring on the front to dismantle. I never did anyway.

good luck, Rob.
 
i don't see how this works.
i undid the small screw and that allowed me to unscrew the 'head' of the lens off.
i unscrewed the retaining ring and there was a small black spacer that also fell out of the tube.
but, there is a small ridge that runs the inner circumference of the tube that stops the glass from falling/coming out. there seems to be no way to remove this ridge. no apparent footholds for a spanner, nothing to turn.
i see no way inside to clean the other side of this glass and that is where the haze is.

i wonder if a collapsible elmar is different?
 
You clean it by sending it to someone with the right equipment to not scratch the very soft interior coatings, can recenter the elements, and make sure it focuses properly when done.

DAG or Sherry Krauter or Jokn Van Stelton at Focalpoint lens.com .
 
well, so far i have not scratched or damaged anything.
where's your sense of adventure?
if i screw it up then i can send it off to the experts.

as it is, i will probably send it to our canadian expert, gerry smith, after a while cause i can't figure out how to get to the haze.

i took a few shots with it this morning so i'll soon have some reults.
 
Like I said Joe, I have cleaned mine successfully. Disassembly is by - almost - hitting the back of the lenshead on a table or equivalent. If you hold the lens in your hand, minimal distance about an inch to the table and hit your hand on the table, Newtons law of gravity makes the glass shake out. There is no more unscrewing to it, it just fits very tightly.

Good luck!

Rob
 
rob, my lens has a ridge that stops the glass from coming out. i did the hit the table thing but nothing moved.
that ridge looks like it's part of the lens tube.
 
And the tube is fixed and solid? What is the number of your lens? Mine is 1492867. Is there a big difference in development time between the two?
Damn. I had no problem shaking them out.
You have the glass moving?

Rob.
 
rob,
after you undid the retaining ring and the black spacer fell out, did you notice a black ridge in the tube just above the glass? the spacer would have rested on it.

i see no way to move/remove that ridge. that is the problem for me.
 
No Joe, I don't remember anything like that. The spacer is just below the retaining screw if I remember correctly? Probably to reduce friction. It should be possible to persuade the glass to 'fall' out. If it would help I could take mine apart again, but I doubt the use of that excercise.
Is it not another thin ring clamped within the tube? To succesfully protect the glass from falling out?

Bad story, this is.

Rob
 
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