This was the June Image Of The Month and was taken using an SBIG ST-8e abg camera. In this case the rgb color exposure portion of the top image was recombined with a more recent M101 luminance image. This required rotation and pixel stretching since a different Centurion and CCD cameras were used.
Exposure times are same as top image.
This image has been cropped down to not show a 100 pixel underlap.