Quote:
Originally Posted by Eratosthenes
Andrew,
I think a 19.999745" is the way to go - overall it performs better under various conditions.
I think it's worth the extra cost and the additional weight compared to your 19.999" should be okay if you have a friend to help you with loading onto the truck. (I would also consider the 19.99999614" which is heavier and out of my price range. Of course there are some 19.9" scopes coming out of China on ebay for about $75 - stay clear of them, the plastic mirrors are light but are near impossible to allign)
|
True - but that aperture can exceed the 20" criteria on a warm day, although i believe you can get the optics made from a single flawless piece of diamond from Zeiss.
After Greg's recent purchase, this question and the coincidence of my children watching Disney's Snow White I had visions of Greg in his observatory preparing a poisoned apple...
Cheers,
Andrew.