I have been trying to image M81 with my TEC refractor for sometime and finally got it done. March was a great month in terms of clear weather. I used a new light box to flat field this image and I am really pleased with its performance.
Exposure: L:213 minutes (unbinned), R:G:B=45:45:60 minutes (unbinned)
Telescope: TEC APO 140 @ f/5.5