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Pancolart
Joined: 04 Feb 2008
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Location: Slovenia, EU
Expire: 2013-11-18
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 Posted: Sun Sep 22, 2013 10:23 am Post subject: NEOKINO Emil Busch |
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Pancolart wrote:
I have this glass chunk with specifications 62,5/135m/m. Do you know how to translate it into standard lens specs? I mean 62,5 is what F value? Lens seem to be full frame / medium format friendly regarding flange (3-4cm space to 35mm SLR mount) and 5x5cm bright image circle.
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Ultrapix
Joined: 06 Jan 2012
Posts: 551
Location: Italy
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| Posted: Tue Sep 24, 2013 6:26 am Post subject: |
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Ultrapix wrote:
Possibly a splittable lens, 62,5 mm and 135 mm are the two FL if splitted or not; may you show the lens? |
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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
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| Posted: Tue Sep 24, 2013 7:34 am Post subject: |
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Pancolart wrote:
Here you can see very similar 140mm: Click here to see on Ebay
I've had lens apart and front consist of two elements, the rear is only one thick. Together forming triplet.
You can unscrew from both ends. I am more inclined 62,5 is some other measure for F.
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SXR_Mark
Joined: 12 Jun 2010
Posts: 506
Location: England
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| Posted: Tue Sep 24, 2013 8:43 am Post subject: |
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SXR_Mark wrote:
Based on this 1899 chart from wikipedia , the most likely candidate for an alternative f-stop marking would be one of the Zeiss systems
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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
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| Posted: Tue Sep 24, 2013 10:15 am Post subject: |
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Pancolart wrote:
Interesting, thanks. Zeiss (old)? I doubt lens is slow or more then F3.5.
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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| Posted: Tue Sep 24, 2013 10:32 am Post subject: |
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iangreenhalgh1 wrote:
Emil Busch were a lensmaker, so I strongly doubt it's made by Zeiss. The funny aperture just means it dates from before the standardisation of aperture values.
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SXR_Mark
Joined: 12 Jun 2010
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Location: England
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| Posted: Tue Sep 24, 2013 12:54 pm Post subject: |
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SXR_Mark wrote:
| iangreenhalgh1 wrote: |
| Emil Busch were a lensmaker, so I strongly doubt it's made by Zeiss. .... |
I am not suggesting it was made by Zeiss.
| iangreenhalgh1 wrote: |
| .......The funny aperture just means it dates from before the standardisation of aperture values. |
Exactly my point. They could have used the Zeiss system for marking lens apertures
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iangreenhalgh1
Joined: 18 Mar 2011
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| Posted: Tue Sep 24, 2013 1:00 pm Post subject: |
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iangreenhalgh1 wrote:
Aah, I see.  Sorry for the misunderstanding.
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
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| Posted: Tue Sep 24, 2013 3:34 pm Post subject: |
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ZoneV wrote:
I have such a Busch Neokino cine projection lens as well - not at hand in the moment.
I think the 62.5 is the barrel diameter for the projector focus housing.
Even today this diameter is sometimes more easy to find than the real f-stop on cine projection lenses, visit Schneider Kreuznach website! And tody this 62,5mm diameter is still used.
I suppose a f-stop not far away from f/2 - f/2.8.
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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
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| Posted: Tue Sep 24, 2013 6:35 pm Post subject: |
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Pancolart wrote:
| ZoneV wrote: |
I have such a Busch Neokino cine projection lens as well - not at hand in the moment.
I think the 62.5 is the barrel diameter for the projector focus housing.
Even today this diameter is sometimes more easy to find than the real f-stop on cine projection lenses, visit Schneider Kreuznach website! And tody this 62,5mm diameter is still used.
I suppose a f-stop not far away from f/2 - f/2.8. |
Splendid. This clarifies it.
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