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[QUOTE=PRejto;977206]Thank you all for your help!
Greg, I'm not sure where you are getting the .57 arcsec figure. If you plate solved my M83 image that image was taken with the barlow at a slightly different distance from the CCD. The photo below, taken at 2x2 binning, was taken just before the PE run I posted in my first post. When I collected data I didn't bin.
The plate solve shows 1.08 arcsec at 2x2, and it shows a position angle of 2 degrees 57 min from North. The MX manual states to have the camera within 5 degrees. Am I incorrect about this?
Hi Peter,
I just used Wodaski's CCD calc and plugged in TEC140, the size of the camera pixels, the number of camera pixels in both directions and the 2X barlow. It gave me 1.14 arc secs. But your barlow may not be exactly 2X. I wonder if that plate solve is dead accurate or if the CCDcalc is.
It doesn't sound like much of a deviance either way.
Greg.
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