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Old 17th Apr 2020, 9:59 pm   #1
onewatt
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Default Quad lens - what's it for?

Hi all,


Bit of an oddball item and not exactly electrical, but can anyone tell me if this lens is from anything potentially important?
I'm assuming its missing 1 lens assembly! more pics available if required.


Very best in these difficult times,
Chris
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Old 17th Apr 2020, 10:01 pm   #2
Graham G3ZVT
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Default Re: Quad lens - what's it for?

I would hazard a guess it's from a microscope.
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Old 17th Apr 2020, 10:05 pm   #3
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Default Re: Quad lens - what's it for?

Or the lens turret from an old 8mm cine camera

Peter
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Old 17th Apr 2020, 10:31 pm   #4
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Default Re: Quad lens - what's it for?

Thanks Chaps,


Obviously not much use unless you have the rest of it, but does anyone have it?
Very Best
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Old 18th Apr 2020, 10:26 am   #5
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Default Re: Quad lens - what's it for?

It does look like a lens from an old 8mm cine camera, probably 1950's or 1960's vintage.
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Old 18th Apr 2020, 7:26 pm   #6
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Default Re: Quad lens - what's it for?

From the white crackle finish, my feeling is a microscope, too. I'd have expected cine cameras to be more grey.
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Old 18th Apr 2020, 7:31 pm   #7
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Default Re: Quad lens - what's it for?

Cine cameras, getting used outside, would likely have had lens hoods. Microscopes don't need them.

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Old 18th Apr 2020, 8:03 pm   #8
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Default Re: Quad lens - what's it for?

Don't microscopes normally have the rotating plate at an angle to the main barrel and the individual objectives splayed outwards to give better clearance for the unused objective lenses away from the slide? This wouldn't apply if you only had very low magnification objectives with relatively large working distances.

I have a vague memory that you could get security cameras with multiple images on a single camera including simultaneous telephoto and wide angle of the same scene.

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Old 18th Apr 2020, 8:33 pm   #9
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Default Re: Quad lens - what's it for?

I would expect camera lenses to have adjustable aperture and focus, unless they were supplementary wide angle /telephoto adaptors. I don't recall cine camera turrets with more than three positions.
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Old 19th Apr 2020, 12:59 am   #10
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Default Re: Quad lens - what's it for?

Quote:
Originally Posted by onewatt View Post
more pics available if required.
Might help!
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Old 19th Apr 2020, 10:23 am   #11
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Default Re: Quad lens - what's it for?

My first thoughts were " TV Camera Turret" but on closer examination, I don't recognise it! and its not very big. Looking at the perforated metal for scale the lenses are small.

Perhaps it is part of some photo beam detector where the leases are selected for distance.

As was said more pictures might help?
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Old 19th Apr 2020, 12:19 pm   #12
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Default Re: Quad lens - what's it for?

If not a microscope, pehaps some other instrument that needs variable magnification / focal length? How about something like a thermal camera?
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Old 19th Apr 2020, 1:06 pm   #13
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Default Re: Quad lens - what's it for?

I bet it is from a low power (5x to 40x as a guess) inspection microscope, the empty hole for minimum magnification.
 
Old 19th Apr 2020, 1:07 pm   #14
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Default Re: Quad lens - what's it for?

My money is still on an 8mm cine camera lens.
One question however, are we looking at the front or back?
More pictures would be helpful.

Peter
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Old 19th Apr 2020, 2:15 pm   #15
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Default Re: Quad lens - what's it for?

It could be off a Vintage Avant Quad lens Polaroid 100 camera ,or something similar.
Looks a bit like this

https://www.worthpoint.com/worthoped...mm-6-524646935
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Old 19th Apr 2020, 3:17 pm   #16
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Default Re: Quad lens - what's it for?

Not pretty enough for a consumer camera, no focus, no iris (f stop) and the lens curvatures look far to small for any large image (like a Polaroid). The cream flecked finish is tops for microscopes too.
 
Old 19th Apr 2020, 3:23 pm   #17
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Default Re: Quad lens - what's it for?

The Quad Polaroid also has two pairs of lenses, not three (four if you include the blank one) different ones as in the object under discussion. Two for a wide view and two for closeup. They took front and profile views at the same time, it was all done by mirrors (well one mirror).
 
Old 19th Apr 2020, 4:49 pm   #18
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Default Re: Quad lens - what's it for?

Hi All,
More pics.
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Old 19th Apr 2020, 5:18 pm   #19
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Default Re: Quad lens - what's it for?

The numbers (magnification?) suggest a missing lens. The most interesting one (highest magnification?).


Why 6 and 6.5 I wonder?


The inspection 'scope idea sounds promising.
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Old 19th Apr 2020, 5:30 pm   #20
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Default Re: Quad lens - what's it for?

The numbers around the grip ring look more like magnification factors than the focal lengths you'd expect on a camera. Also the empty hole gets 17.5 which may be the factor for the rest of the 'scope.

My stereo microscope here on the bench needs twin lenses for every mag factor, of course, so the turret is arranged as a barrel with the light path radially through it. Each lens set gets used forwards and backwards, giving two different magnifications, though the empty position causes the same factor to appear in two places on the turret knobs.

This looks like a lens turret from a mono microscope.

The advantage of fixed lenses over zooms is that they can be accurately calibrated to use with measuring graticule eyepieces.

David
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