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Author Topic: Mystery Lens
Bryan Chernick
Jedi Master Film Handler

Posts: 654
From: Bothell, WA, USA
Registered: Mar 2010


 - posted August 08, 2017 10:22 AM      Profile for Bryan Chernick   Email Bryan Chernick   Send New Private Message       Edit/Delete Post 
I know this has nothing to do with 8mm but I thought there may be someone here that could tell me what this lens goes to. I picked it up with a lot of other film stuff I purchased recently. It's brass and very heavy. It's about 2 inches in diameter.

I opened it up to clean the lenses and found there are two elements separated by about a 1/2 inch with a collar. each element is flat on the side that is exposed on either end of the brass cylinder with about a 1/2 inch of straight glass then convex on the inside. so the two convex ends face each other. The lens element on the end with the collar is slightly smaller than the one on the other end. It seems odd to me that the convex glass is inward facing like that.

It looks like it could be a projector lens but there are no markings on it anywhere, inside and out. Other than the collar there are 4 holes on the side of the barrel that may have been used to mount it on something. It is very heavy for its size.

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William Olson
Master Film Handler

Posts: 287
From: Poughkeepsie, NY USA
Registered: Jun 2010


 - posted August 08, 2017 10:39 AM      Profile for William Olson   Email William Olson   Send New Private Message       Edit/Delete Post 
It looks like it could possibly be a lens that fits between the light source and the film gate of a film projector. I forget what it's called but it would focus the light source into the aperture of the film gate. I had a DeJur750 that had something just like this.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007


 - posted August 08, 2017 11:06 AM      Profile for Maurice Leakey   Email Maurice Leakey   Send New Private Message       Edit/Delete Post 
It could be a lens from a 35mm cinema projector. The holes might be to locate the focusing mechanism.

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Maurice

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Bryan Chernick
Jedi Master Film Handler

Posts: 654
From: Bothell, WA, USA
Registered: Mar 2010


 - posted August 08, 2017 12:34 PM      Profile for Bryan Chernick   Email Bryan Chernick   Send New Private Message       Edit/Delete Post 
quote:
It looks like it could possibly be a lens that fits between the light source and the film gate of a film projector. I forget what it's called but it would focus the light source into the aperture of the film gate. I had a DeJur750 that had something just like this.
Thanks William, it looks like it probably is a condenser lens based on it's design. I suspect it would be for a 35mm projector based on its size. Now the question is, what projector or other device could it have come from?

Maxwell view Condenser lens

Maxwell View and Maxwell's Optical Theorems

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