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Posts Made By: Andrew Riehl

January 30, 2003 06:06 PM Forum: Off Topic Discussions

Really far off forum topic.....

Posted By Andrew Riehl
this idea has come up before, and the portaball guys have been thinking of it for some time. the problem is there are other axes to consider in the system, aside from the two dimensional x/y coordinates.

January 31, 2003 01:57 AM Forum: Equipment Talk

Meade UHT Coatings Worth it?

Posted By Andrew Riehl
only if you want to bring it up to par with a celestron 'starbright'

January 31, 2003 02:01 AM Forum: Film Astrophotography - Imaging and Processing

M45... Pleiades Nebulosity!!!

Posted By Andrew Riehl
a real beauty. enough said.

January 31, 2003 07:50 PM Forum: Film Astrophotography - Imaging and Processing

1st timer question - eyepiece projection

Posted By Andrew Riehl
Any adition to the system, beit an eyepiece, camera adapter, different projection distances, etc. changes the focal length and thusly the f/ratio of your system. I can't give you any details personally on how to adjust the focal length calculation, but check around on the web, you should be able to find info. Try:
http://www.mapug.com/AstroDesigns/MAPUG/CalFRato.htm

http://home.earthlink.net/~tkurkowski/Photo_Basics/35mm___Film/F-Ratio_for_Eyepiece_Projectio/f-ratio_for_eyepiece_projectio.html

January 31, 2003 10:08 PM Forum: Equipment Talk

Pier-mounting LXD55 (AR5/AR6)

Posted By Andrew Riehl
check out LeSeur; they make a very nice premade pier. Others are out there, do some web searching.
http://www.astropier.com/

February 2, 2003 12:31 AM Forum: Equipment Talk

Fastar System on Celestrons

Posted By Andrew Riehl
I don't know. In SCT's it's more of a name game and advertising hype than anything else. Not a big meade fan personally (if you didn't notice before smile ), but I will say Meade's answer to fastar is a native f/6.3 OTA with an f/3.3 reducer yielding ~f/2 or so. common answer from meade fans is that they don't want to hang weight off the corrector lens. Fastar just makes better images (although in an 8" you're limited to just an st-237 or possibly some starlight express cameras).

February 2, 2003 12:39 AM Forum: Equipment Talk

Missing Atlux in the USA

Posted By Andrew Riehl
Orion was the sole vixen distributor for some time. An atlux mount is not the kind of product that fit into their market very well (along with many other great vixen products). Now that Televue is bringing in vixen stuff, all their products will be available. If memory serves me correctly, a Williams Optics GT-1 is very similar to the atlux (even uses the ss2000 controller)...one of these may be a lot easier to find on the used market than an atlux. Don't hold me to any of this though...

February 3, 2003 10:47 PM Forum: CCD Imaging and Processing/Solar System

Autoguiding,Optical Encoders, Interface?

Posted By Andrew Riehl
I can't give you any direct details on your specific control system, but I would recomend you contact Norbert Tackman. He's the guy sbig refers you to when you have such an issue usually. Goto:
http://home.earthlink.net/~ntack/
and email him, he's a wealth of knowledge on the source and is happy to help (he was for me at least).

February 5, 2003 12:56 AM Forum: Off Topic Discussions

Speaking of Mars

Posted By Andrew Riehl
As am I...time flies lately; it seems like only yesterday I was psyching myself out for the last opposition. Hopefully we won't be cut short by a global martian dust storm this time...

February 6, 2003 08:00 PM Forum: CCD Imaging and Processing/Solar System

Autoguider Guide Scope Focal Length

Posted By Andrew Riehl
a good guideline for guidescopes is to have at least half the focal length of the main scope (I would prefer a lot more than half though). Are you guiding for film or ccd? with film, I would say throw a barlow between the ranger and st-4 and you'd probably be fine. CCD is usually a lot pickier.

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