Guiding at longer focal length
Hello,
I have guided quite successfully with my MX mount using an 80mm f6.25 Aquila scope with my ST-i camera. I can normally see errors in guiding below .5 pixel. (TSX camera add on)
Recently I have been trying to guide through the ONAG on my TEC140 (f7)
I am seeing quite large guide errors (1+ pix) and so far I cannot find a combination of exposure and aggressiveness, etc to make this better.
Using my Aquilla guidescope the resolution is 3.05 arsec/pixel and binning 2x2 through the TEC140 = 3.11 arcsec/pixel, thus I would expect to be able to guide with the same accuracy, or is my analysis just wrong?
I would really appreciate any tips to getting this right.
Thanks,
Peter
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