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Posts Made By: David Tarshis

February 24, 2008 07:06 PM Forum: Equipment Talk

GM-8 vs GPDX

Posted By David Tarshis

I know this is an old discussion, but would like some quick info. Equip I have: GP on wooden tripod, 9.25, ED80, Canon 20D. Purpose: I would like to dabble in astro photography and right now I'm considering GPDX with SS2K. Thanks

February 29, 2008 07:03 PM Forum: Beginning Astronomy?

Looking for ....

Posted By David Tarshis

a web site that describes and illustrates the different views in perspective to orientation in different scopes i.e. refractor vs sct vs reflector. Thanks

February 29, 2008 10:44 PM Forum: Digital SLR AstroPhotography

What can I expect with my 20D, ED80 & GPDX?

Posted By David Tarshis

Got the 20D end of last year, have had the ED80 since they came out (399.99) and I'm getting the GPDX soon. Thanks

March 4, 2008 08:08 PM Forum: Equipment Talk


Posted By David Tarshis

I have Starry Night Pro 5.1 and I'm getting a GPDX with SS2K soon. What can I anticipate as far as getting ASCOM to work? The SS2K has 2.03 that I plan to upgrade to 2.10. Any thoughts or comments. Thanks

March 9, 2008 01:14 AM Forum: Equipment Talk

Power supply GPDX

Posted By David Tarshis

Just got my GPDX and now need power for it. The manual says 12 volt battery or 12 volt ac adapter that has capacity for 2 amperes. I saw one in the store that only had 500 ma and was guessing that wasn't enough. Recommendations? Thanks

March 21, 2008 02:59 PM Forum: CCD Imaging and Processing/Deep Sky

Armed and danerous

Posted By David Tarshis

Ok, so I now have in my possession: GPDX with SS2K (my newest addition, fist light two nights ago 15 minute gap in the clouds, couldn’t wait) Orion ED80, focal reducer for the ED80 (variable), t-ring adapter and camera adapter, Canon 20D and C9.25 and an unfinished 12.5 f/6. So now what? Where am I going to get my best shot? Thru one of the camera lens with the camera mounted on the scope? Thru the ED80? The C9.25 will have to wait for photo ops. It’ll be taxed on the GPDX for photo. I’m a complete noob with this photo thing. Looking for a little guidance. Thanks

August 31, 2008 06:25 PM Forum: Digital SLR AstroPhotography

Got me a GPDX!

Posted By David Tarshis

Ok, what I have: GPDX, Canon 20D, Orion ED80. Need some pointers. Lens I have for the 20D: 70-200 2.8 IS, 50 1.8, TC 1.4x, and a 18-55 kit lens 4.5-5.6. Need some pointers to get started, thanks!

September 13, 2008 07:39 PM Forum: Digital SLR AstroPhotography

First real attempt at astrophotography (M31)

Posted By David Tarshis

So here's my first attempt, and I didn't even use a telescope! 32 exposures, dark, flat, bias and light. Stacked in Deepskystacker, pretty much fumbled through it. Canon 20D, 70-200L IS, 1.4TC for focal length of 280mm (448mm 35mm equivalent) mounted on my GPDX.

October 24, 2008 02:49 AM Forum: Telescope Making

Curved Protostar in a truss?

Posted By David Tarshis

I have a curved Protostar that was slated for a tube project. That tube project has now turned into a truss project. Has anyone ever tried to install a curved 180 degree spider into a truss scope?

March 21, 2009 04:39 AM Forum: Telescope Making

12.5 f/6.4 project upper cage question

Posted By David Tarshis

I'm using the Krieg book, his formula makes it a 7.5" strut height. The telrad is 8.5" alone. I'm thinking 8.5" - 10". ID I have at 14.25". Any ideas? I'v seen a couple of 12.5's with a 12" upper cage which makes for a longer mirror box, would like to keep mine as short as possible. Would like some input, thanks. Cheers