I went out to image M100 and this was nearby, so had to grab a few frames.
http://www.fortlewis.edu/observatory/image_detail.asp?ID=203
http://www.fortlewis.edu/observatory/image_detail.asp?ID=203
Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD
http://www.fortlewis.edu/observatory