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10" plus SCT for Planets?

Started by GregDamiani, 09/20/2003 03:42AM
Posted 09/20/2003 03:42AM Opening Post
I live in South Florida. In the summer (especially) skies are far from transparent, but are very still. Perfect for planets (but little else). I am interested in the most detail and best planetary views for a reasonable price.

I know that seeing usually limits planetary work to 5" to 8" inches aperture. Local dealers have advised - not so in So. FL. One gentleman advises he does most of his viewing & imaging with a C-14 and does not find seeing to be a great problem.

I am considering a 10" - 12" inch SCT (Meade 10 or 12, or Celestron 11). Assuming good seeing, how are these scopes on planets. I know the central obstruction is significant, and will hamper contrast. Is this deficit compensated by greater resolution and light grasp?

I am used to an AR 6 with some mods (no chromacor). Any comments as to how views will differ? I am looking forward to no false color, but I am really wondering if the resolution will be noticbale visually?

From a practical standpoint, how much more difficult (or easier) are the SCTs to set up. I carry the AR 6 & LXD55 mount in one piece. The OTAs on the SCTs look less cumbersome as the tubes are shorter. Are they movable in onw piece?

Thanks.

Gregg
Posted 09/20/2003 01:03PM #1
Gregg,

A 10" or larger SCT should certainly do better than a 6" f/8 achromat, expecially under southern Florida skies (lucky you). You might give some thought to a 10" or larger quality Newt too, on a equatorial mount or equatorial platform if at all possible.

Actually, I'd rummage around and see if you can find some local amateurs with similar scopes you can look through. IMHO, no one should buy a telescope without seeing an example under the sky first.

Clear skies, Alan
Posted 09/24/2003 12:27AM #2
I once read (probably here)that the 9.25 has a longer focal length primary. Longer focal length mirrors are easier to repeatedly manufacture with good quality.


Mark