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8-inch GEMs- recommendations?

Started by JPMashie, 12/07/2007 03:55AM
Posted 12/07/2007 03:55AM Opening Post
I am new to the equipment but have gained a lot of experience in the last year. I was very pleasently surprised by the view in my C6N- Advanced series Newtonian. In thinking of moving up to an 8-inch, I had some questions. The reason for 8 is portability- I find 10 simply too large. I prefer the GEM as well.

1- Is there a real difference in the view between the Schmidt-Newtonions by Meade and the Advanced series by Celestron?

2- Are there other brands/models I should consider?

I know these questions give away my skill-level, but I am learning. What I am trying to do is avoid reinventing the wheel, or telescope in this case by listening to the advice of the experienced, and perhaps opinionated.

Thanks, Rich



Posted 12/07/2007 04:28AM #1
>>>2- Are there other brands/models I should consider?

I know these questions give away my skill-level, but I am learning. What I am trying to do is avoid reinventing the wheel, or telescope in this case by listening to the advice of the experienced, and perhaps opinionated.

Thanks, Rich
-------

Hi Rich:

I have some experience with the scopes you mention as well as quite a few others. I do have an 8 inch F/5 Newtonian on a Celestron CG-5 ASGT mount as well as various smaller and larger DOBs and EQ mounted Newtonians etc...

A few thoughts/opinions:

- For visual work, I would go with the 8 inch F/5 standard Newtonian over the SN. The 8 inch SN has a 38% CO vs a ~25% for the CN8. It is also F/4 rather than F/5 which makes it tough on eyepieces, I think F/4 to be avoided unless there is good reason to choose it specifically. The corrector leads to slower cooling.

- Given the choice between the 8 inch F/5 on the GEM and 10 inch F/5 DOB, most nights I will choose the DOB. It is easier to setup and the 2 inches of aperture more than makes up for the lack of motorized tracking. If I am driving to the mountains for an long evening, it is often my choice over not only the 8 inch F/5 but other larger scopes like a 12.5 inch F/4.06 and a 16 inch F/4.42, both Truss/Strut Dobs.

The 10 inch OTA is 48 inches long and weighs about 35lbs. It fits across the backseat of any car I have owned including an old Nissan Sentra.

So that's my two cents, based partially on opinion but with a lot time at the eyepiece included.

I think you can see the 10 inch DOB and the 8 inch F/5 in this photo...

Jon

Attached Image:

jonisaacs's attachment for post 118838
Posted 12/07/2007 02:07PM #2
Let's get down to basics.

How much do you want to spend? 8)

What's the max length you're willing to lug around? 8O

Jeff

"Don't sweat the petty things and don't pet the sweaty things" 8O