What camera used a 49mm screw mount?

[Steve Goldstein]

A friend picked up a lens-to-telescope converter at a local camera show today. But he doesn’t know what lens to look for, and neither do I.

 

[Paul Howell]

All I can think is Leica 39mm, Patricia/Pentax M42 and Miranda 44mm which was a second mount in addition to the Miranda bayonet. I'm sure there are others.

 

[grat]

Originally, telescope to camera adapters were of the "T mount" variety, which used an 42x0.75mm threaded mount and inserted into a telescope eyepiece tube.

A number of manufacturers (William Optics for one) now offer telescopes with 48mm threads that you can screw an adapter onto, and use the camera's native mount on the other side in place of an eyepiece.

So if you have a Nikon "F" adapter, you would thread it onto the telescope, and use the Nikon body to attach to the adapter, allowing you to use the telescope itself as a really big honkin' lens.

 

[gone]

Are you sure it's not a T mount and 48mm, not 49mm? That's what my lens was, and I had accidentally thought it was something else. T mounts apparently come in various thread sizes.

 

[benjiboy]

Some early Canon SLR lenses took 48 mm filters.

 

[AgX]

A friend picked up a lens-to-telescope converter at a local camera show today.

You created quite some confusion...

For those who think of mounting a camera to a telescope, this is done without camera lens, bur the camera is coupled by an mechanical adapter to the telescope directly, respectively to a dedicated optic (flattener).
These telescope-side adapters have typicaly a T-mount end, thus 42x0.75mm

But there are also tele-attachments (optical converters) to mount in front of a camera lens. These attachments have male filter threads out of which 49mm is common.