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Dobson 8" or 10" ?

Started by Tico, 08/22/2015 06:59AM
Posted 08/22/2015 06:59AM Opening Post
I'm thinking of buying a Orion Dobson Skyquest Intelliscope xt.
But I have the following question: worth buying 10 "model instead of 8"? I mean, worth 2 inches more in exchange for greater weight and size? manageability?
Greetings and thank you
Posted 08/22/2015 10:18AM #1
Almost always, the short answer is bigger is better. For a Dob, 10" is still on the easily portable side and you will be able to see a lot more. People who have an 8 will often dream of having a 10; those with a 10 won't dream of an 8 (but maybe a 12!). Tom Dey

29-inch Dob in a dome
36-inch upgrade soon
LUNT 80/80 solar scope
FLI 6803 cam
APM 100mm APO Binos
JMI RB-16 Night Vision Binos
Zeiss 20x60 IS binos
Posted 08/30/2015 01:15PM #2
If all other aspects of the scopes were equal, I'd go with the 10 inch. However, Orion makes many different models and the 8 and 10 inch scopes may have different focal ratios. The faster the scope the more critical the quality of the mirror is. 2 inches may not seem like a lot, but in light gathering and resolution it's pretty substantial. I have looked through several Orion scopes of 8 to 12 inches in aperture and they were all pretty good. Orion is decent about returns, so if you aren't happy with your scope you can probably ship it back for an exchange.
Posted 10/23/2018 11:22PM | Edited 10/23/2018 11:23PM #3
I have owned several 8 " newtonians and 5 10" newts, two were Orion intelliscopes and I still have the last 10i I bought.  I've also owned 3 12" (2 I pieced together myself), 2 14" and 1 16" newt.I've always favored the 10" newts over the 8s, because of the extra brightness one can see in DSOs.  as far as the 12s, 14s and the 16, I lean towards the 14 as the quality of one particular 14  (Earl Watts made the mirror) was such that it regularly outperformed some 16s side by side, and the 16 was a monster to transport.  I have had 6" f-5s as well.  over all I would like to have a 6", 10" and 14" newt as they seem to cover all of my astronomical cravings for now.
  If I were in your shoes , I'd go with the 10i even though it's a little more cumbersome.  Of course it's all your choice.  I believe Orion scopes have GSO mirrors, but they are of very good quality.
Jim Phelps