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planetary scopes

Started by lthaxton, 09/03/2002 09:25AM
Posted 09/03/2002 09:25AM Opening Post
Well, I guess I will add my thoughts to the discussion. For the most part I am pretty much limited to planetary viewing as I live quite close to Los Angeles. Over the years I have had a chance to use and compare several scopes for this use. A 10" DOB, properly collimated and with excellent optics is a killer planetary scope-I own a Portaball 10" with a Zambuto mirror. Last season I had a chance to compare it on Saturn to a 7" APO triplet at a remote, dark location. The majority of those present voted that the 10" put up a better image-resolution and contrast considered.

At home the best images of the planets have come through a 6" F/15 D&G refractor. I have a 4" flourite and a 5" Meade APO both of which do an excellent job but the light grasp of the 6" wins out in providing finer detail. I also have an old 8" F/8 reflector and it too is a killer planetary scope. The more time I spend, the more I find myself gravitating to scopes of 6" or larger diameter. Having more light to work with is just easier. Having said that, I admit that the images through the 4" flourite are stunningly sharp and quite satisfying!
Posted 09/03/2002 09:33AM #1
Hello Larry,

I aggree!

The best shots on the planets ever made are all with *big* mirrors, mostly perfect collimated Newtons with small diagonals. These guys reach detail of 0.1 arcsecs now (in their photos) which will *never* be visible in a perfect 6" flourite apo. I only know one frenchman with very good planetery results with a Meade SCT 10".

My flourite Baby-Takahashi with only 60mm diameter is very good and sharp on planets (with 6x Barlow-projection) but my mediocre Discovery Newton 10" f/4 and my very good Starsplitter 10" f/6 is *much* better at good nights.

Thanx
Tom
mehr freude. http://www.licha.de 49° 13' 54" N