M81 LRGB+H-Alpha Shot over 9 nights from my backyard observatory in Fremont, Michigan, this is the combined luminence, RGB and H-Alpha from last season when I was using the TMB130 F7 Refractor, the 40 minute luminance sub exposures gave prominance to the otherwise very faint "Integrated Flux Nebulae" the main reason for the long exposures. Total Exposure time 37.6 hours Location: DownUnder Observatory, Fremont MI Date of Shoot 21st, 30th, 31st January 2012, 1st, 5th, 6th, 9th, 11th, 13th February 2012 22 x 40 min LUM unbinned 10 x 5 min LUM unbinned RGB 6x15 min each 7x40, 13x60 min H-Alpha Camera: QHY9M monochrome CCD www.astrofactors.com StarlightXpress Color Filter Wheel Optics: Thomas M. Back TMB 130SS F7 Refractor. Williams Optics WO68 Field Flattener. Autoguided using QHY5 autoguider, StarlightXpress Ultra Slim Off Axis guider Paramount GT-1100S German Equatorial Mount (with MKS 4000) Image Aquisition software Maxim DL5 Stacking software CCDStack Post Processed with Photoshop CS5 Star Spikes Pro II