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Posts Made By: Gregory Cunniff

March 21, 2010 07:47 PM Forum: Mounts

Some Questions About Mounts

Posted By Gregory Cunniff

First off, I would like to say I am a relative beginner to astronomy, so any advice you can offer would be appreciated. I am currently in the process of learning the sky with several pairs of binoculars and I'm just now getting comfortable to the point where I am considering the purchase of a telescope. Obviously, there are a couple different ways I could go, but at this point I am strongly considering an Orion reflector for the following reasons:

1) Orion offers a number of packages with the Sirius EQ-G mount, which is recommended as a best value mount for astrophotography in the Backyard Astromomer's Guide. I should probably stress here that I do not plan on jumping right into astro-imaging, as I understand the difficultly of this sort of thing for beginners. However, I am an avid amateur photographer, so the idea is certainly something that would be appealing to me down the road in the event that I can obtain a certain level of proficiency with a telescope.

2) What does not appeal to me is the idea of upgrading a mount every time I want to consider upgrading the scope. I would rather put my money into a good quality mount from the start that will allow me to utilized a number of different scopes as needed. The reflector tubes are priced quite reasonably, which would allow me to put the money into the mount. Down the road, I might be interested in adding a nice refractor (Tele Vue makes some nice ones, but as a beginner, I cannot justify the price) or a catadioptric. Ideally, I could just purchase the tube on mount it on the Orion mount.

Having said this, here are a number of questions that I have concerning these mounts or mounts in general -

The equatorial mount seems like a good option to me. Certainly, many of the reflector telescopes are offered in packages with this mount configuration. Would this mount also be appropriate for a refractor or catadioptric telescope?

Some of you may argue that a GOTO mount is a poor choice for a beginner and that I should take to time to learn the sky without it. Fair enough - I happen to agree with you and I will make every effort to proceed in that manner. Others might argue a GOTO mount would be a good choice given that fact that I am a beginner and will struggle locating points of interest. Again, I think this is a valid point. However, I would like to ignore this argument for the time being and simply take into consideration my preference to purchase a mount that will allow me the most versatility.

In summary, what I am looking for is a quality mount that allows me to upgrade to other scope options without having to continually upgrade the mount. I would like an equatorial mount with motors and the option to utilize a GOTO feature. And finally, I would like a mount that work well with astro-imaging, in the event that I expand into that (which seems likely).

If anyone has any comments, suggestions or recommendations for me concerning mounts, I would really appreciate it. Perhaps me thinking is completely flawed and if so, I would like to elicit your opinions before I invest in any equipment.






December 4, 2010 06:30 PM Forum: Eyepieces

Orthoscopics

Posted By Gregory Cunniff

Looking for some opinions on ortho EP's. Purchased my first scope a few months back (Stellarvue SV70ED) and I'm slowly putting together a set of EP's. At this time, I'm doing mostly planetary and lunar observation, due to the low power of the scope I'm using. I've got a couple orthoscopics from University Optics (9,18) because I think they represent good value for the money. I also have one of their 38mm 70 degree EP's which is a really nice low power EP. Obviously I have some gaps in my collection and I've been looking at other eyepieces.

Can anyone comment on the Baader Planitarium or Televue Plossl EP's? If you've got some of these EP's AND EP's from UO, I would be interested in knowing how they compare.

Also, any discussion on the plossl design vs. the orthoscopic design would be appreciated. What are their strengths and weaknesses? What criteria would you use in purchasing one over the other?

Of course, any recommendations you might have for other EP designs I might consider purchasing would also be welcome.

June 17, 2011 03:37 AM Forum: Mounts

Celestron CG-5GT Mount

Posted By Gregory Cunniff

I'm looking for opinions on this motorized equatorial mount. Seems like a good value at $615 (and free shipping) through OPT. The mount features 2" steel dia. tripod and holds up to 35 lbs. By contrast, the Orion Atlas features 2" dia. tripod and holds up to 40 lbs - and costs $800 more.

One difference that I noticed in the literature for these mounts is that the Atlas is capable of 9 different slew speeds, 3 tracking speeds, backlash compensation, and periodic error correction. The Celestron doesn't mention any of these items - it has a slew speed of 4 degrees. As such, it would seem that the Orion would be a better choice for astrophotography.

Anyway, I would be interested in opinions on either one of these mounts.