Anyone familiar with Orion 120 ST Refractor?
Posted 03 November 2003 - 08:50 PM
Just wondering if I am expecting too much, or maybe scope has bad optics. Lots of problems focusing on Mars and other planets. So much so that I am wondering whether to return it. Dan
Posted 03 November 2003 - 09:48 PM
Posted 03 November 2003 - 09:51 PM
Posted 03 November 2003 - 11:46 PM
Posted 04 November 2003 - 05:54 PM
Posted 04 November 2003 - 06:00 PM
Posted 04 November 2003 - 06:05 PM
You are right on the money. The scope is designed for views of neblua and clusters, ect. But, I am surprised that it seems to be totally useless for anything else. I would expect some common (cheap) refractor problems, but not so pronounced that nothing else can be viewed. Another point...I set it up beside my ETX 125 a few nights ago..
Even with much lower powers, the Orion wouldn't deliver imagaes as bright and clear as the Meade. The only thing it seems to excell at is bright star clusters . That's a little too specialized for my tastes. Dan
Posted 04 November 2003 - 06:43 PM
Posted 04 November 2003 - 06:54 PM
Posted 04 November 2003 - 07:00 PM
Posted 04 November 2003 - 07:31 PM
Now is get a chance to let everyone know that I am new to the hobby and am trying to learn more about it. That's part of the fun, learning new things. So here goes...
Tonight...I put on the lens cover, removed the small stop-down lid on the front and aimed the scope at the moon. Instant contrast with a 26mm. I put in a 2x Barlow. Same results. Then a 10mm, a 10mm with the Barlow and the v block filter. 120 x and crystal clear. Now I am confused.
First...does this tell me anything about the scope? Or is this normal when you stop down the scope? Help. Dan
Posted 04 November 2003 - 09:58 PM
So instead of an f/6 you now have an f/18 or so -- that should be pretty color free! I used to have a 80mm f/15 scope and there was never any color issues with it although it was only a doublet.
I am not an optics expert and am more than willing to be corrected by the more knowledgeable.
Posted 05 November 2003 - 12:57 PM
Posted 05 November 2003 - 06:45 PM
Posted 06 November 2003 - 09:49 PM
What do defocused stars look like in the ep?
Does the objective lens appear to be set roughly square in the tube?
Posted 07 November 2003 - 05:59 PM
Posted 07 November 2003 - 06:41 PM
Posted 08 November 2003 - 02:00 AM
Is this scope made by Synta, and has your focuser got any slack in the draw-tube?
Mine had, but I fixed it by adjusting the two small Allan bolts (1.5mm) next to the focus lock knob. Both of these tiny bolts only needed turning a small amount and this improved my views significantly. Now the tube is rock steady and not too stiff
Now I only need to wait for a clear night to try midwestman’s fix.
I had to disassemble the focuser to discover that these bolts were there.
Didn’t get a manual with my scope
Check the star image either side of focus and tell us what you see.
BTW Does anyone know what type of grease to lube these focusers with?
Posted 08 November 2003 - 10:03 AM
Ive been using hi temp thin lithium grease on my parts. It dosent get thick when subjected to extreme cold.
Lithium brake grease is about the same stuff at any auto parts store too. Dave
Posted 08 November 2003 - 09:41 PM
Thanks for the info on the grease, I’ll go hunting some.
Since I’m new at this I never even thought about the cold effecting the grease.
Posted 26 November 2003 - 03:36 AM
A Refractor Designed for Deep-Sky Exploration!
Orion AstroView™ 120ST EQ Rich-Field Refractor
This telescope was not designed for high-power examination of planetary or lunar surface detail; for that we recommend the AstroView 120, with its longer focal length. Rather, the 120ST excels for breathtaking, wide-field images of deep-space delectables set against their stellar backdrops. A new refractor with a new purpose—that’s the Orion AstroView 120ST EQ!