- Planewave CDK 12.5" @ f/7
- Astro-Physics 900 GTO mount
- SBIG STL-11000M C1 camera
- Astrodon Gen II Luminance filter
- Astrodon MOAG off axis guider
- SBIG AO-L adaptive optics unit running at both 5 Hz and 0.5 Hz
- Manual focus based on visual inspection of star images only
- Seeing 6/10 Pickering
- Transparency 3.2 NELM (based on SQM readings)
- Casual polar alignment based on Losmandy PAS only--likely within 15 arcmin of pole, but no better
- Collimation based on Cheshire and laser only--no stars used for collimation
First, let's get some caveats out of the way. This is a first light report, and I have not in any way "optimized" the system yet. I performed a basic collimation using a cheshire eyepiece and a laser collimator, but have not given the scope a final "tweak" under the stars. I believe there is still some work to do on this--I think the secondary is very slightly off center, and the focuser probably needs a bit of shimming as well since rotating the focuser shifts the laser onto and off of the secondary spot. Also, please keep in mind when comparing CCDInspector results on different scopes that the percent field curvature is only valid for comparison across similarly sized CCD's. A value of 20% curvature with a 35mm chip might be more like a 5% value with a smaller chip. Finally, I haven't yet gotten the autofocus working, so focus is very rough--based simply on a visual inspection of diffraction spikes on Vega--trying to make them as narrow as possible.
O.K., enough caveats and explaining away of imperfect results... Let's get to what I found.
First, a CCD inspector measurement of a 5 minute subexposure of M15.