Joe (quote)"That does it! Next Big Bang, someone has got to rethink this gettin' old business!" Joe Daugert -------------------------------------------------- >>>>>>>>>>>> ISTAR Scope Club <<<<<<<<<<<<
Tele Vue-85 Meade 8" SCT Nova Hitch Berlebach UNI 24 Meade 12" LightBridge Orion ED100 Losmandy GM-8 Orion SVP Quarter Hitch
Quote:I'm still agonizing over which mount to get for my forthcoming refractor.Initially, I just assumed it should be an equitorial because most of the photos I see of refractors have them mounted on an EQ. But, the more reserach I do, the more of a pain these eqs seem to be. Balance and stability; meridian tracking; polar alignment (rough or otherwise); change in balance and apparent motion when shifting from east to west configuration, etc. Seems like everytime I read more about the eqs, I find another little glitch that needs to be dealt with.I'm a spoiled newbee with an LX 200 GPS GOTO on alt-az. To set up, I just get the tripod level, mount the scope, turn it on and go for a beer. By the time I get back, the scope has downloaded time, date, and location, found north, level, and tilt, and is pointing toward the first aligment star.GOTO and visual tracking performance are exceptional (to me) and the mount is rock solid with no noticable movement while focusing.So, I ask, is there an eq mount that convenient?Assuming one is not going to do AP, what would be the advantage of an eq over alt-za?Thanks,
- Jared Willson
AP900GTO, AP1200GTO, DM6, Tak Epsilon 160, 12.5" F/3.8 AG Optical Newtonian, C9.25, 8" LX200GPS, 18" Starmaster w/Zambuto F/4.3, ES ED127mm CF, FS60C, SV80 FLI ML8300, QSI640WSG-8 SX Lodestars Some Uncle Al's glass hand grenades www.doghouseastronomy.com
Jeff Morgan - Wile E. Coyote School of Telescope Making
Quote:Assuming one is not going to do AP, there is NO advantage for you to use an EQ over what you have.
“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
Quote:I want GOTO for regular star gazing because I'm lazy, but a good set up for star hopping because, #1 I need to learn to do it, and #2 I want to do the Messier thing.I want the capability to eventually do some AP.Bob
N11GPS Fastar//TOA-130S//MK66 Std//AT6RC//Vintage C5//Megrez II 80mm APO//SolarMax 40 NJP Temma II//Sirius EQ-G Too Many Astro-Cameras//Mallincam Color Hyper Plus Two not-spoiled Golden Retrievers - Casey and Nelson Lot 19 Deerlick Astronomy Village (Canis Major)
Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering. - Arthur C. Clarke
Quote:Another advantage is an eq mount allows me to engage in one of my favorite pursuits, finding planets in the late afternoon sky before you can see them naked-eye. The manual eq setting circles are what you want for this.Besides, there's just a certain rightness to using an equatorial mount for astronomy.Mike
Quote:But, I have a questopn for you. If you set up in late afternoon, as I frequently do, you can't see Polaris. How do you align?
Quote:A GEM mount doesn't NEED to be complicated to use.. You can buy a basic GEM (CG5) for LESS than a decent quality Alt-az mount and get the benefit of slow motion controls and single control tracking.. You don't need to accuratly align a GEM to get the benefit of the design. If you just plop it down and do a rough alignment, you can easily keep a target centered with just the RA slow motion control. YOu now don't have to worry about clutches and center of gravity shift when changing from big eyepieces to small ones.
Quote:Of all the great advice I've gotten here, your comment hits the nail on the head...the certain rightness about having a refracter on a GEM.But, I have a questopn for you. If you set up in late afternoon, as I frequently do, you can't see Polaris. How do you align?
Quote:...If you are a perfectionist and need it dead-on you can look up the star-drift alignment method. Once you have it, make a small mark on the ground or wall, then next time align to that.
Quote:Star drift is mainly used by imagers for very precise alignment.
Quote:It's largely personal preference. In my mind, the biggest advantages of the eq mount are in tracking and star hopping. I know you have a driven goto mount. And not to turn this into a goto thread, but let me say that they do fail (frequently judging from the public sessions I attend), leaving the observer to basic star hopping (assuming they know how, and there mount is actually operable without goto). With an eq mount, north is always north, east is east, etc. With an alt-az mount, up-down-right-left only corresponds with north-south-east-west when the scope points at the zenith. The farther away one moves from that point, the less scope motions correspond to chart directions.