Date:
4/13/2007
Location: Tierra Del Sol, California SDAA Club site
Conditions: 0% moon, seeing 6/10, transparency
7/10, temperature 59 F
Telescope: Televue 85mm refractor, 600mm focal length,
F7, prime focus, no
diagonal.
Mount: Losmandy G11, Gemini goto, polar scope used to align,
rough drift alignment
Guiding: C8 Celestron 8 scope, TouCam Pro web cam, PHD software
Camera: Canon Rebel 300d
Focusing: Manual used Imaged
Plus software focus option with Canon Rebel.
Exposures: (6)
4 min raw 800 ISO, (6) bias, (6) darks
Processing: IP 2.75 - converted raw to FITS, align-rotate, combine median, digital
development with sharpening, converted to jpg, Photoshop CS;
levels, color balance,
unsharp mask, Gradient Xterminator, reduced size for web.
Comments: This is my first attempt
at guiding through the C8. It never lost the guide star but it
seemed to be making large corrections. I was using a magnitude
7 star in the cluster. I think my focus is off. I used
IP 2.75 focus routine, but was not sure what values to use the
luminance or one of the color channels?