| Author |
Message |
    
Walkersj
Tinkerer
Username: Walkersj
Post Number: 13
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 07, 2010 - 11:39 am: | 
|
Has anyone experience of getting inside the above shutter? I've removed teh shutter from the camera, removed front and back lens elements, but there is no ring evident in the front to get further in. There is a black cover ring with the infinity stop in it, which I assume has to be removed. However it is not obvious how it comes off. Does the infinity stop hold the ring on, and if it does how is the stop fixed on? |
Johnnyh
Tinkerer
Username: Johnnyh
Post Number: 10
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 08, 2010 - 08:43 am: |
|
I've looked at my 16-20, but from your description I infer that it may not be quite the same model of shutter; any chance of you posting a picture of it as far as it is dismantled? |
Walkersj
Tinkerer
Username: Walkersj
Post Number: 14
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 08, 2010 - 01:42 pm: |
|
I put the thing back together again, but here it is on the camera. Does this look familiar?
 |
Johnnyh
Tinkerer
Username: Johnnyh
Post Number: 11
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 09, 2010 - 05:04 am: |
|
Ah, that's a later model shutter than the one on my 16-20, but it looks very similar to the one on my 12-20. It's a little while since I had that dismantled, but if I remember correctly, the shutter face (accessible after removing both front lens elements) is retained by a ring with serrated edges. It would look a bit like this Prontor:-
http://pheugo.com/cameras/index.php?page=prontor&WEBMGR=c860ab990860635c40383e41 19601c63 |
Walkersj
Tinkerer
Username: Walkersj
Post Number: 15
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 09, 2010 - 12:56 pm: |
|
Thanks for reply. Unfortunately it is the removal of the front plate with the shutter speed numbers is the problem. If you remove the front lens element the next element seems to be fixed in with a ring with no spanner notches. Anyway it is buried in a collar, and the front plate is outside of the collar. Does the whole front unscrew, but I would have thought that it would be difficult to have it stop exactly in the right place. |
Johnnyh
Tinkerer
Username: Johnnyh
Post Number: 12
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 09, 2010 - 02:52 pm: |
|
Yes you have to unscrew the next element. Where, as in this case, the lens manufacturer has not provided spanner notches, they're sometimes screwed home too tightly to undo with a 'rubber bung' friction type hand tool. I have sometimes managed to undo them by gripping in a vice *with_rubber_jaw_inserts* being careful not to over tighten. (Do not try to use a plumber's or 'Mole' type wrench!) If that fails I have had to cut my own spanner notches with a small fine-tooth hacksaw blade, first covering the lens glass with e.g. cotton-wool to catch the filings, and cleaning up carefully before unscrewing. It sounds drastic, but once you've done it the first time it all seems easy ;-) |
Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 32
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 09, 2010 - 02:56 pm: |
|
Well sometimes there are no slits or notches and you have to do it like this :
http://www.flickr.com/photos/29504544@N08/2999448799/in/set-72157608592479767/
Or like this :
http://www.flickr.com/photos/29504544@N08/4224977552/in/set-72157622962172593/
Or maybe use special lensgrippers. |
Johnnyh
Tinkerer
Username: Johnnyh
Post Number: 13
Registered: 06-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 09, 2010 - 03:22 pm: |
|
Oops, nearly forgot this bit ...
"Does the whole front unscrew, but I would have thought that it would be difficult to have it stop exactly in the right place."
The second element just screws back firmly into the shutter body as far as it will go, then that bit is correct. It's the first element where you should re-enter the multi-thread helicoil at the same position as it emerged from the second element tube, if you marked the original position (e.g. Infinity) to return to and if you want the lens lettering to be in the original orientation. But in any case it's wise to check the focus on e.g. a piece of Scotch tape stuck across the film plane. |
Walkersj
Tinkerer
Username: Walkersj
Post Number: 16
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 11, 2010 - 10:54 am: |
|
Thanks everyone for suggestions. Keith South of The Living Image Camera Museum http://licm.org.uk/ kindly sent me some instructions and photos. The second element unscrews out with its holder, but was quite tight. I was able to grip it in a three jaw lathe chuck. There is another ring with slots underneath that which releases the front plate. |
