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Sander1981
Tinkerer
Username: Sander1981
Post Number: 4
Registered: 04-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2011 - 03:14 am: | 
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Dear all,
I have a rolleicord III model K3B. The taking lens seems OK, but the viewing lens is loose. I guess it needs adjusting and then needs to be fixed by a screw or whatever is needed to keep it where it belongs.
My question in this: Can I trust the taking lens (is it usually calibrated on the scale on the focussing knob)?
Is it then possible to adjust the viewing lens by placing things in front of the camera at distances similar to the focussing knob and then make sure that everything is sharp?
If so, do I measure the distance from the lens to the object or from the backplate to the object? Or is this nonsens, and I need to focus to infinity?
I'm asking all these questions because I have read some threads here about adjusting focus, but they all seems to be about the taking lens, which in my case doesn't need any I think...
Best,
Sander |
John_s
Tinkerer
Username: John_s
Post Number: 48
Registered: 07-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2011 - 12:03 pm: |
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Distances should be measured to the film plane - effectively the back of the camera. The taking lens should agree with the focusing scale unless it has been messed with. What I would do is set the focus to infinity and adjust the viewing lens to focus on a distant object, say more than 200 yards away. Then repeat for something say 10 feet away, hopefully they should agree. Then I would put a film through it focusing on objects at various measured distances. I'm not sure on this camera how to refix the viewing lens, there may be a screw under the leather covering. |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 1131
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2011 - 08:53 pm: |
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Never trust engraved distance numbers. You can check the taking lens at infinity http://rick_oleson.tripod.com/index-123.html and set the focus knob to match (yes, the knob is adjustable - an excellent reason not to trust it, but there are others). Once you have that set, then set up the camera with a groundglass in the film plane and compare the image there to the one in the viewfinder. What matters is that they match each other, not that they match an engraved number that you'll never look at while shooting.
I have notes on adjusting the viewing lens of the Rolleicord (based on the IV, but I think the III should be very similar). Email me at rick_oleson@yahoo.com and I'll send you a copy. |
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