Questions tagged [screw-mount]

A style of lens mount that uses screw-like threads to attach the lens to the camera body. Examples of screw-mount lens systems include the M42/Praktica/Pentax thread mount (1 mm thread pitch), T-mount (42×0.75mm), and M39/LTM Leica Thread Mount (26 threads per inch). This tag should not be used for questions related to tripod screw mounts.

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What is the flange focal distance of CS mount lenses? Is it 12.500 mm or 12.526 mm?

I've searched online a lot, and found plenty of sites that quote both numbers. There appears to be agreement that the C-mount flange focal distance (FFD) is 17.526 mm (exactly 0.69 inches). The CS-...
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1answer
108 views

Which lens adapter do I need to use an auto Sicor-XL lens with a Nikon camera?

I recently got a Nikon D3400 and an old auto Sicor-XL lens and wanted to use both. Only problem is that they don't use the same mounting system. Which lens adapter can I use for my D3400 with a Sicor-...
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2answers
981 views

What is this old Zeiss Tessar lens, with a large mount ring with six holes?

This old Carl Zeiss f/4.5 250mm lens belonged to my father, who said that it was used for some kind of wooden electrostatic-photocopy machine from a document-copying shop that he used to run. Please ...
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1answer
137 views

How tight should a lens be screwed onto a Leica Screw Mount?

I have a Canon 7 rangefinder. How tight should a lens be screwed onto it?
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1answer
336 views

Can I use Pentax screwmount lenses on my Nikon DSLR? [duplicate]

Can I use my old camera lenses of Ashahi Pentax SP1000 screw mount in my Nikon DSLR D60 camera? If possible, where can I get the necessary accessories?
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3answers
2k views

What adapter to mount a screw thread lens on Nikon D90?

I have a Soligor 450 mm lens with a 40 mm dia camera body end thread connection. I would like to try adapting it to a D90 AF system. Are there adapter rings available out there for this purpose?
11
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1answer
1k views

How do I identify unknown thread mounts?

A local thrift store is selling a macro bellows with thread (screw) mounts. The mount is not identified. I have a cheap digital caliper. What are the likely mounts that it could be, and how can I ...