300mm f3.0 as telscope?

[jorn]

I have a 300mm high quality large format lens. It's made for projecting large format film with an size of around 4x5". Is a lens with an aperture of 4" and f3.0 practical as a telescope? I was thinking about something like televue. Is there any other applications or ideas on what i could use this lens for?

[Merlin66]

These lenses sometimes have poor performance under the stars.

They are not designed to work with an object at infinite.

Having said that, there are MANY projection/ copy lenses used as finders.

It would be worth trying it out as a wide field camera.... you never know, you may be lucky!!

[roundycat]

What make is it? Can you adapt it to fit a camera? Many such lenses are optimised for working over a short distance and may not be so sharp at infinity. Only one way to find out.

Dennis

[jorn]

It's a projecta-vision.

her is a picture: