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Message |
    
Clie
Tinkerer
Username: Clie
Post Number: 1
Registered: 06-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, June 09, 2013 - 07:42 pm: | 
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I've got this lens and want to open it up to clean the internal elements of oil. Seems its the 4/4 lens configuration.
How do I open it up?
Do I put a rubber kitchen stopper on the front name plate and turn anti clockwise hard?
The name ring doesn't seem to move when I twist it. Not enough pressure?
Appreciate any help? |
Arfd
Tinkerer
Username: Arfd
Post Number: 25
Registered: 01-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 11, 2013 - 03:05 am: |
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First off, I haven't worked on this Minolta lens. But what must be stated repeatedly, even shouted from the rooftops, is that attacking any lens, particularly zooms and telephoto lenses, from the front is not always the best way to go! The Zuiko 135mm/2.8 can be tackled from the front but in many configurations the ist element is held by a retainer inside the optical tube.
Look for any setscrews on the bottom edge of the focusing collar, or if there are any under the rubber grip. If the whole collar can be slid out of the way (mark its position before) you may be able to access and unscrew the whole front cell.
An easier option is to look for 1 or 2 setscrews on the side of the filter ring. Sometimes these are only visible when the lens is set to minimum focus. The whole filter ring complete with name ring can then be unscrewed giving easy access to the front optical group. If you unscrew it scribe its position beforehand. |
Michael_linn
Tinkerer
Username: Michael_linn
Post Number: 85
Registered: 04-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 11, 2013 - 09:38 pm: |
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Some of the Minolta MC lenses have soft internal coatings which cannot be cleaned by what we would consider to be normal methods here.
I know Minolta admitted (along with Leica) to using soft coatings internally to the camera repair profession, but I am not aware that an official list was ever published.
I seem to remember that the 35/2.8 MC and the 58/1.2 MC were in that category. |
Gardener
Tinkerer
Username: Gardener
Post Number: 25
Registered: 02-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 12, 2013 - 09:35 am: |
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That would depend on which of them you have - it would seem that you refer to Rokkor-QD. In that case, yes, you have to unscrew name ring to remove front elements. |
