Quote:
Originally Posted by moonstar
Thanks for the info guys  . After all your advice and more reading I am thinking a 10" or 12" DOB maybe with goto. The only thing now is which brand. I did read somewhere here about different brands having different lense materials, something to do with cooling off period. Any updates or advice on this would be great  . Have a great night everyone
Pete |
The glass in the scope makes very little difference as far as cooling time is concerned. Rather good glass doesn't change shape while it is cooling. The two main glass types used in commercial dobs are BK7 (Used in the GSO/Bintel dobs and the Meade Lightbridge series) and Pyrex, which I believe is still used in the Skywatchers (but I cannot find specific info on that!) Both are perfectly alright.
Skywatcher do collapsible Go To Dobs and from what I have seen and heard the build quality is good and most reports on the Go To say it is OK. GSO/Bintel/Meade dobs are not usually available with Go To but can be retrofitted with a Argo Navis Push To system.
Malcolm