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Might as well make a fool of myself here

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#1 Greyhaven

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Posted 19 August 2012 - 04:17 PM

7 Years ago I purchased a Star hoc 90mnm-F11 on a GEM mount w/ single drive motor. The motor has directional control and single,2x and4x speed control. The gist of the story is I've been too lazy to use it properly I tend to use it as an alt as scope for grab and go and used it as such for the transit of Venus this June and i was really pleased with the few AP I got. The scope preforms well optically . I'm concerned with its quality. I know that the scope is a GSO
the drive motor has no markings but the hand control is numbered GS280 so I assume GSO also. I also know that mounts are rated 1,2 3 3a,.... Can anyone tell by the Photos which GEM style this seems to fall into
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I've taken some shots of the mounts components.
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and
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and yes my son's dog ate the mounting ear off the metal housing of the drive motor
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rear connections to drive motor
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hand control
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The scope completely assembled and balanced in alt & az as far as I can tell clutches loose and scope stays in any position I place it.
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and
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Power supply
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counter balance weight
http://i1171.photobu...andscope011.jpg
I would appreciate knowing if this set up would handle short exposure AP < 30 seconds if I can get a good polar alignment it is equipped with a polar alignment scope.
I may have been under estimating the abilities of this scope in favor of my 5i and Hardin DSH 12. I only paid $254.00 for the scope w/ mount, 6x30 finder, drive motor assembly and 3 eyepieces so I figure it's a keeper.

#2 rmollise

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Posted 19 August 2012 - 04:26 PM

Yes, if you keep it well balanced, are careful with polar alignment, and keep the focal length reasonably short.

#3 Falcon-

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Posted 19 August 2012 - 04:37 PM

I also know that mounts are rated 1,2 3 3a,.... Can anyone tell by the Photos which GEM style this seems to fall into


Well if by "rated" you are talking about some of the common designs then I can tell you that this is not an EQ-1 nor an EQ-2. Beyond that I can not narrow it down too much other then to say it is also not an EQ-5 - perhaps the experts here can chime in on that....

I would appreciate knowing if this set up would handle short exposure AP < 30 seconds if I can get a good polar alignment it is equipped with a polar alignment scope.


This will depend entirely on the focal length used. I can tell you that with poor polar alignments and a very much beat-up old EQ-2 I was able to get reasonable results at very-wide FOV imaging using camera lenses. I would be very surprised if your mount does not perform better then my old EQ-2. :)

I highly recommend that you do use the mount as a tracking platform to do wide-field AP. Lots of nice big targets out there to be imaged that way!

As for imaging through the scope - hard to say given I do not have any experience with that mount type. I would *guess* that given a good polar alignment you should be able to do at least short (30s) exposures though. :shrug:

Have fun with it! :)

#4 Midnight Dan

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Posted 19 August 2012 - 06:15 PM

Looks to be in the vicinity of an EQ-3.

-Dan

#5 Greyhaven

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Posted 19 August 2012 - 06:48 PM

A big thanks to Uncle Rod, falcon and Dan I feel better that the set up looks like it should give me usable results and is worth trying at least some AP. Wish the skies would be clear tonight :cloudy: :cloudy: :cloudy: :cloudy:ain't gonna happen.
Be Well
Grey






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