Astromart

A recent thread regarding this topic was discussed on the SBIG Yahoo!Groups. Much discussion ensued, some even with math formulas! The consensus was that if you use a guidescope then you should try to use a guide focal length of 1/3rd to 1/6th of your imaging focal length. I currently guide at f.l. 320mm, yet image at around 1100mm. When I go to 2500+mm imaging f.l. I'm going to an OAG (to take flexure out of the picture).

All that said, if you have a good solid mount, good polar alignment, low PEC (use PEMPro), and adjust your guider min and max moves with CCDWare guider calculator then you will likely do just fine with any number of setups.

Best,

Tom

October 24, 2006 03:55 AM Forum: CCD Imaging and Processing/Deep Sky

Rosette

Posted By Thomas V Davis

Nice shot! It would be a great thing to image at that site.

Tom

October 24, 2006 11:23 PM Forum: CCD Imaging and Processing/Deep Sky

NGC1499 midportion in H-alpha

Posted By Thomas V Davis

Thanks for the comments.

Tom

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What size guide scope?

Rosette

NGC1499 midportion in H-alpha

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