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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 19th Apr 2020, 8:35 pm   #21
emeritus
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Default Re: Quad lens - what's it for?

On checking my screw thread book, the standard thread for microscope objectives is 51/64" x 36tpi, Whitworth thread form. The standard "D" mount as used for older 8mm cine cameras is 5/8" x 32tpi, Unified thread form. "C" mount is 1" x 32 tpi., Unified form.

51/64" = 20.2mm approx, and 5/8" = 16mm approx, so measuring the bore should indicate if the lenses are standard microscope or cine, or something completely different.

Low power microscope looks more likely from the latest photos.

Last edited by emeritus; 19th Apr 2020 at 8:41 pm.
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Old 19th Apr 2020, 9:39 pm   #22
onewatt
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Default Re: Quad lens - what's it for?

Ok guys,
Thank you. Itís at the shop, but next time Iím there Iíll bring it home and take some measurements.
Vy interesting!
ATB
Chris
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Nothings too big or too heavy, otherwise it wouldn't be where it is!
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Old 19th Apr 2020, 10:20 pm   #23
Radio Wrangler
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Default Re: Quad lens - what's it for?

The small apertures mean more depth of field, but a dim image, so bright illumination is needed.

David
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Old 20th Apr 2020, 7:42 am   #24
Craig Sawyers
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Default Re: Quad lens - what's it for?

The small snout at the front with an internal thread is an interesting feature.
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Old 20th Apr 2020, 8:38 am   #25
Radio Wrangler
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Default Re: Quad lens - what's it for?

Mount for a ring of filters/polarisers?

David
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Old 6th Jun 2020, 7:24 am   #26
jimjim1
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Default Re: Quad lens - what's it for?

6, 9, 13, 17.5 may be the focal lengths of the lenses.
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