You'll need the little airy disc to validate your collimation. I agree with Dennis, you're too far out of focus for quantitative results. Metaguide is ok. If you are serious about reaching collimation for imaging purposes only, then its hard go past
CCDInspector
It will provide you with the following info;
- FWHM
- Aspect Ratio
- Background Brightness
- Signal to Noise Ratio
- Altitude of the image
- Curvature amount
- Collimation error
- Tilt in X
- Tilt in Y
- Date and time of the image
- Image Scale
- Focal Length
- Pixel Size
- Camera Gain
- Total stars used in analysis
The blurb -
http://www.ccdware.com/products/ccdi...r/features.cfm