Quote:
Originally Posted by deepblue
An thinking of a 10 or 12 in Guang Shen dob and wanted to get a few pointers. I realise the 12 in is large and heavy, but has anyone had experience of moving the 12in around. Is it do-able - I am fairly large and strong with no bad back as yet....
The OTA comes off from the mount, but how difficult is it to take off/put back on the mount?
Also a question on colimaters. The laser variety sounds perfect for the newbie but I have read elsewhere on this site that best not to use them. What type of colimater is best/easiest to use?
Finally eyepieces - what focal lengths would be appropriate for the GS980 to give a good range of magnification and wide field of views?
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the 12" is fine unless you are a tiny guy ie 5'1" and 50 kgs! The extra $$ is more than made up by the aperture!!!!
Galaxies and nebula are superb in a 12"
Ken (BallaratDragons) has the same scope as mine but in 12" compared to my 10". I was amazed at the sombrero galaxy with the same eyepiece, just different scope.
re collimation, I believe it is a long term learning curve......ie there is simply no easy instant way! get yourself a good sight tube for aligning the secondary and lining up the primary(
http://www.andysshotglass.com/Collimating.html a movie to view or
http://www.schlatter.org/Dad/Astronomy/collimate.htm), but most importantly, learn to star test(
http://legault.club.fr/collim.html)
I am able to use a 4mm TMB in my 1250 focal length 12" scope = 312x magnification. in say a 1500mm, the range may be say 5mm on a good night right up to 31mm or 40mm.
By the way, welcome, a great place to find help