Should I buy the Orion 120mm f/8.3 refractor
Posted 01 November 2003 - 03:07 PM
just get the OTA and some tube rings and use the same mount
right? So tell me, Yeah buy it, you will love the views of
the planets over the reflector, or tell me no don't buy it.
You have allready spent enough money on astronomy stuff.
Besides it's too cold to go outside to play with a
telescope now anyway.
Posted 01 November 2003 - 04:44 PM
Posted 01 November 2003 - 05:11 PM
OTOH, I love the views out of the refractor! Not better or worse than a reflector, but different in a good way. I love my reflector as well, but the contrast is better with the unobstructed reflector. At $319 + it’s hard to go wrong.
Since the clouds don’t appear to be going anywhere soon, you may want to hold out for a sale from Orion (although their sales usually apply to their package deals) or check their 2nd’s. Or better yet, check out Astromart. Great deals on refractors appear there often. Don’t waffle though … you gotta be quick! I got my Meade 5” almost new with rings, finder, diagonal & EP for $275. Missed out on a Skywatcher 6” for $250 though.
Posted 01 November 2003 - 07:38 PM
just my reflector for now. After I read a few reviews of
the 120mm refractor, it seems that there are qc issues with
them. People are saying it is hit or miss wheather you get
one with good optics or not. Plus I don't like the idea of
lying on the ground to look through the thing. That is one
thing I like about the eq reflector is the comfortable
viewing position while sitting on the observing chair I
bought. I think i will keep an eye on the astromart ads
Posted 01 November 2003 - 08:57 PM
Posted 01 November 2003 - 10:19 PM
Posted 01 November 2003 - 11:11 PM
Posted 02 November 2003 - 04:27 AM
Posted 02 November 2003 - 11:52 AM
So, why did I upgrade my original AstroView 120 for the SkyView Pro 120? The short answer is the AstroView mount and tripod system. By Orion’s own service tech’s admission, this OTA pushes the AstroView to the edge of its capabilities. I found the AstroView system was usable with this OTA, but focusing at higher magnifications was quite difficult due to mount movement and tripod vibration. There was a large amount of “slop” and free play in the mount. Tightening the adjustment screws reduced this condition, but did not eliminate it. Placing the tripod on grass helped, and I’m told the anti-vibration pads also help a bit. There are web sites that provide suggested tweaks to further decrease AstroView vibration, but this OTA is simply asking a lot from the AstroView system due to its weight. The SkyView Pro mount and steel tripod on the other hand, are a completely different story. This OTA is rock steady on the SkyView Pro system. If I had to assign a numerical comparison, I would say the SkyView Pro is three to four times steadier than then the AstroView for the 120 f8.3 OTA
I have no real experience with reflector telescopes (I’m a refractor enthusiast), so take this into consideration when reading my comments. It is true that at zenith the viewing position is low, but I don’t find it impossible. (The SkyView Pro tripod does give you additional height that helps with this issue). The views are sharp, stars are nice bright pinpoints, and a 120mm worth of aperture is a good amount to see many DSO’s beyond the planets. Fellow astronomer friends of mine have commented on how ridiculously good the views are from the OTA for the price. Is false color evident? Yes, but when properly collimated it is relatively little, and then only shows itself mostly on bright stars like Vega. I do not use a minus violet filter at this point. (Admittedly CA false color does not bother me like it does some folks. I’m sure that if I became accustomed to high-end APO views, it would be more noticeable to me). I have very little cool down time, which is important to me during cold Midwest winters.
My point is that I consider this OTA a fantastic bargain for the price. You certainly can use it with your AstroView system, but will probably need to tweak the tripod and mount to get optimum performance. I wouldn’t let Synta quality control issues scare you away as Orion is one of the most dedicated companies I’ve found when it comes to insuring their customers satisfaction. If you get a bad sample, they will make it right. Hope this post helps make your decision a little easier… (Scott)
Posted 03 November 2003 - 01:37 AM
No apologies needed for loving the refractor. This is a refractor forum, afterall. We mean no disrespect to reflectors or any other type of proven optical system. Let reflector owners try and tell me I don't sport a terrific and versatile scope. I'm always glad to elaborate for those who want to know the absolute pleasure of owning a relatively inexpensive, well-performing 4.7 " achro on a decent mount.
I have a Pacific Instruments Sky-Watcher (Synta) 120mm- pretty much the same in many ways as the Orion or Celestron version. The HEQ5 is one great mount for the price; similar in performance to the Vixen Great Polaris, I heard.
Posted 03 November 2003 - 04:45 PM
Posted 03 November 2003 - 06:22 PM
Stability and rigidity of the tripod becomes critical with the added height, but you can sit Indian style fairly comfortably while viewing at the zenith depending upon how bigga boy ya are.
Mine is on a 48" pier and with the added height of the mount to the OTA, a small beer cooler is what I sit on while the tube is pointed straight up.
When mine was on the factory tripod, I used all manner of contortions to view at the zenith. The diagonal/eyepiece was practically scraping the driveway...well not that close, but it was pretty far down to the ground.