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Fredster
Tinkerer
Username: Fredster
Post Number: 12
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 30, 2009 - 08:38 pm: | 
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Summer is here so the old sticky lenses come apart for new lube. I've put back together a prewar collapsible and it's nice and smooth now, too smooth in that the barrel wants to rotate to the collapsible position when I turn the aperture ring. Is there an adjustment for the lens to lock in the extended position? |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 930
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, July 01, 2009 - 08:49 pm: |
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My notes don't mention it, but usually in a collapsible lens there is a light trap, sort of a velvet O-ring, between the 2 moving halves of the barrel. It is common for this to become disrupted in the course of disassembly and reassembly of the lens, and this will result in a loose fit similar to what you describe. Did you notice a piece like this when you had the lens apart? |
Fredster
Tinkerer
Username: Fredster
Post Number: 13
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 02, 2009 - 12:01 am: |
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Hello Rick. Your tech notes CD was a great help (and a fun read), but I couldn't get the flange at the bottom of the barrel off, so I could also not get the sliding lens mount off. I believe the flange is threaded on and held by a screw. The screw came oft easily, but the flange would not budge. It looks as if there is a bronze bushing between the lens mount ring and the lens barrel, held by two screws. My super-duper job of cleaning and lubing the barrel seems to have reduced the friction too much. The fit is great, but when I turn the now very smooth running aperture ring it turns the barrel out of lock as if I had intended to collapse the lens. I saw no O-ring or cloth. |
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