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David J Ismay
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 18, 2006 - 05:18 pm: | 
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I have been sorting through some old kit and found a beauty of a lens which was probably my late fathers. [I can't remember getting it!]
The lens is without any kind of mount and is therefore unlikely to be for Rollei or Kodak.
It has a smooth barrel which suggests perhaps a projection lens?
On the barrel is V- XR.50 -V
Complete with end caps it is in great condition butwhat the H*** can I use it for?
Any suggestions will be carefully considered!
I contacted Schneider with serial no etc but no reply! |
Winfried
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 19, 2006 - 07:24 am: |
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It's probably a lens designed for a movie camera. Before zoom lenses were invented many amateur movie cameras used semi-interchangeable lenses like the Longar.
Longar is a lens name which is used for the semi-interchangeable tele lenses for the Kodak Retina system but I remember faintly that it was used for other tele auxiliary lenses (with different design), too. |
Dave
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 20, 2006 - 04:34 pm: |
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Thanks, the light at tunnel end begins to glow however I am not very literate when it comes to techy. matters!
Can you shed some more light and explain how a lens can be semi [half?]inter-changeable?
I have studied this beasty again and its shape does not remind me of movie camera lenses I have seen. Those I have owned or played with from Bolex 16 to Pathe 9.5 have always had some sort of focus arrangement e.g. helical screw or rack and pinion which is why I favoured projection which would allow for a simple friction / slide adjustment. If you know the spec of the Schneider Longar perhaps you could let me know and I could then research possible uses. Thanks! |
Glenn middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 20, 2006 - 08:20 pm: |
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I would suggest that this is a 1.4x focal length converter. Your comment that there is no form of mount or attachment threads is somewhat of a puzzle, unless the thing was inserted into the barrel of the lens it was paired with. The idea of convertible lenses is nearly as old as photography itself
You can buy a modern form of this converter for the Rollei 6000 series auto-focus and it ain't cheap. |
Winfried
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 21, 2006 - 12:18 am: |
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I almost agree that this is some kind of tele converter to be mounted in front of the lens.
Semi-interchangeable lens means that some elements of the lens are mounted on the camera, and only the front element(s) are changed when changing the focal length. This system was in use with many leaf-shutter SLRs. On these some lens elements are between the shutter and the camera body, and to change the lens completely you would have had to change the shutter, too, which would have been quite costly. So some manufacturers designed lenses with the front lens element(s) in a special mount, and you could change the front part of the lens. This system was widely used with the Kodak Retina cameras, and the tele 'lenses' offered for these also had the Longar designator. Anyhow I remember having seen plain tele converters with Longar designator, too.
This tele converter does not need its own focussing mount or helicoid. Focussing is done via moving the base lens as usual. Since most cine cameras had a mirror reflex viewfinder system focussing could be controlled via the viewfinder.
BTW similar tele converters or attachments are widely offered today for digicams. |
