Optics source

I'm playing around with a large reflex finder design that uses a mirror rather than a lens. So, I'm looking for a parabolic mirror about 3-6" in diameter at F/1.25 to F/1.5, without a central hole. The optical quality need not be anywhere near diffraction limited: a molded design is probably fine.

Can you suggest a source for such a mirror?

Thanks,

Allen

Thanks. They do have a 6" F/1.4, but it's a precision Zeodur $425 item. Not exactly in my price range.

They also have some 40mm F/0.75 steel mirrors for $2 each. The price is right, but the size isn't within reach.

Before I spend hundreds for a mirror, perhaps I'll try some optics software. The free version of ATMOS should be enough. It'll do three surfaces, and I really only need one. Are there any better freeware ray-tracing programs?

Does anyone have any idea how to evaluate the virtual image quality of a device that projects the image to infinity? This seems to be quite different from the typical spot-diagram analysis I've seen.

Allen

Allen,

I got one, a 6" F1.0. It needs to have the coating removed and redone. It is close to a full thickness pyrex mirror.

If you are think you can use I,m sure we can work out a deal. Let me know.

Scott