500mm reflex lens for astrophotography?

Started May 24, 2012 | Discussions thread
Regular MemberPosts: 145Gear list
Oops! shoudl be inre "You want a refractive..."
In reply to Agitprop, May 25, 2012

Aperture rules, and absolute aperture rules absolutely.

That said, lenses have looser surface tolerances than mirrors by a factor of 2, so they are easier to make more accurately. On the downside, they have more surfaces (usually 4, sometimes 6). And smaller is sometimes good, as a 90mm refractor is easier to mount than a 150mm reflector. But tame the mounting and the thermal issues, and a good reflector will beat a refractor of equal cost every time, as you'll have a lot more aperture to work with.

I have spent quality time looking through lots of telescopes, and while there's something incredibly seductive about a good refractor, really good reflectors are right up there. The best view I've ever had was through a 2.5m (that's right, meter) reflector. Blew every Astro-Physics refractor (including a 7") away.

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God loves the noise just as much as the signal.

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