New C8s - Cheap!
Posted 22 March 2013 - 12:26 PM
In this case, these are brand new C8 OTAs featuring Fastar secondaries, a Vixen-comatible rail, a Celestron RDF and a hideous metallic orange paint job. I picked one up last year in a whim to take on an observing trip and to later use for outreach and to loan to friends. The one I received happened to have optics as good as any SCT I've ever owned. I remain quite happy with it and have added an Orion finder shoe, Scopestuff Delrin fine focus knob, Celestron flexible dew shade (works with both C6 and C8), Roberto's Knobs and Pacific Designs soft case. It will likely accompany me on my next long duration dark sky trip this coming September. What's not to love about 8" of aperture you don't feel guilty abusing over extended periods in harsh environments?
In any case, I noticed that Highpoint Scientific (with whom I have no relationship other than as a happy customer) still has some of these Nexstar C8 "unbundled" OTAs available...for just $799.
Now that's a great deal.
Posted 22 March 2013 - 01:12 PM
Posted 22 March 2013 - 01:44 PM
The "ugly" has actually kinda grown on me. So much so that when I set it up to observe, instead of a black RACI I use a metallic silver RACI. The clash between the silver on a GSO finder and the metallic orange on the OTA is pretty extreme. Like wearing plaid and stripes at the same time.
Posted 22 March 2013 - 01:46 PM
And, I think it's kinda purty esp. in the sunlight.
Anyway, at night you can't see the color.
Posted 22 March 2013 - 02:37 PM
Posted 22 March 2013 - 03:02 PM
Here's a pic of my old 1985 SP C-8 and the Nexstar 8SE...
Posted 22 March 2013 - 03:04 PM
Yup, works like a charm. And it's a fraction of the price of a Feathertouch Microfocuser.
Posted 22 March 2013 - 03:06 PM
Posted 23 March 2013 - 06:59 AM
Posted 23 March 2013 - 07:14 AM
Posted 23 March 2013 - 07:27 AM
Overall I think the Celestron Orange tubes are the most visually appealing especially on a black mount.
Now, my little Etx 90 had them all beat!
Posted 23 March 2013 - 04:38 PM
Even so, i can see myself owning one in the future...
Posted 23 March 2013 - 08:30 PM
Posted 23 March 2013 - 09:06 PM
I say "much loved" for the 8" SCT in that it pretty much destroyed the market for EQ mounted Newtonians back in the day. It packed a lot of aperture into a tidy package and rode on a very portable mount comfortably. Note that "much loved" and "~50% of them have poor optics" are not mutually exclusive. There's a lot to love in compact, portable aperture, even if the quality of the image isn't so great.
Posted 23 March 2013 - 10:26 PM
Posted 23 March 2013 - 11:03 PM
I just finished collimating in the wake of installing Bob's Knobs on mine last week, and after re-collimating I cruised a few showcases under moonlit skies using an alt-az mount. I can move the whole kit and kaboodle out of the shed in one go. I'm definitely getting lazy.
I was also playing with the Celestron FF/FR visually using a 28mm RKE. Without the FF/FR, the stars start to go comatic starting in the outer 30% of the FOV, and get progressively worse all the way to the field stop. With the FF/FR in place, the stars start to deform in the outer 15% and get progressively worse in the way to the field stop. Also, the manner in which coma is manifest changes. The stars become comet shaped with tails pointing away from the center. With the FF/FR in place, the coma manifests as "seagull" shapes with the "v" pointing to center and the "wings" flattening out to the sides.
It definitely doesn't achieve the level of flattening or coma correction of the EdgeHD scopes (or the Meade ACF scopes for that matter), but with moderate AFOV long focal length 1.25" eyepieces it does tidy up the outer field a great deal.
Posted 24 March 2013 - 12:36 AM
Posted 24 March 2013 - 03:49 AM
What do you have attached after the fr/ff?
Posted 24 March 2013 - 09:05 AM
What do you mean when you say 50% of them have been "soft" optically and the other 50% had "good optics"? What is the difference between those two extremes? Is it obvious visually or merely subtle? I have only looked through one C-8 and that was at an outreach Monday night. So I have little to compare your comments against in trying to understand what you mean.
Posted 24 March 2013 - 09:24 AM