A comparison of 3 images at consistent ISO 800 level and similar temperature to compare noise levels of unmodified Canon 400D and 40D DSLRs with Baader BCF modified Canon 70D. 400D image from 3/1/2011 40D image frrom 2/12/2012 700D image from 31/12/2013 Post processing to mosaic in Adobe Photoshop CS5 For best comparison, look at in 'Original' size. The 400D noise is quite noticeably high but the 70D is still easily better than the 40D. Also see a comparison of various ISO levels for the 70D this same date. Telescope - Apogee OrthoStar LOMO 80/480 with Hotech SCA Field Flattener, Hutech IDAS LPS-P2 filter (except 400D), Canon 400D unmodified, 40D unmodified and 70D Baaded BCF modified DSLR field 106' x 159' , Ambient ??C, 16C &17C respectivley.
The Flame and Horsehead nebulae are located near the blue giant star Alnitak, the easternmost of the 3 stars in the belt of Orion. The Flame nebula (below Alnitak) is an emission nebula powered by the Ultraviolet light from Alnitak. The Horsehead nebula (to the right of Alnitak) is a dense cloud of dust and gas where star formation is going on. Both are part of an extended area known as the Orion Molecular Cloud Complex that stretches for 100's of light years and is ~1500 light years from Earth and includes the Great Orion Nebula in the sword of Orion. The diffraction pattern in the upper left is due to the bright star Alnilam just outside field. This is a first use of my new Astrophotography modified Canon 70D on this object . It compares well with longer 300Sec subframes 10/11/13 in the darker skies of Perth Observatory. This is a re-processed version done in 2020 for a better colour balance and texture. DeepSkyStacker 3.3.3b51 Stacked 85% of 17 Images ISO 800 180 Sec, 24 DARK @ 120Sec, 32 BIAS, 12 FLATS. Post-processed with Adobe Photoshop CC 2021, AstroFlat and Noise Ninja (reprocessed 2014 DSS stack image) Telescope - Apogee OrthoStar LOMO 80/480 with Hotech SCA Field Flattener, Hutech IDAS LPS-P2 filter, Baader BCF modified Canon 70D DSLR field 106' x 159' , Ambient 18-17C. EQMOD EQASCOM with Ascom 6 for mount control. Backyard EOS Pro 3.0.3 for Image acquisition. Mount - Skywatcher NEQ6 Pro. Guidescope - Orion ShortTube 80 with Starlight Xpress SuperStar (Mono) CCD Auto Guider and Stark Labs PHD auto guiding software.
Gum 1 - The head of the Seagull nebula is both an HII region and reflection nebula. Gum 2 - The wings of the Seagull Nebula is a large HII shell surrounding some bright hot UV radiant stars. A first imaging of this object with my new Astrophotography modified Canon 70D from home in the suburbs. It compares well to a prior attempt from the darker skies of Perth Observatory 10/1/2013 with f/4, 8" Newtonian showing the greater Hydrogen-Alpha red sensitivity from the AP modification. There appears to be a gradient present that might bear reprocessing when time permits (Note: see 2020 reprocessed version here). This cropped version makes the gradient less obvious, but still present. Note: 1/3/2014 this came back to haunt me ... it looks like it was light entering via the Canon 70D viewfinder! See also following night from darker skies of Perth Observatory. DeepSkyStacker 3.3.3b51 Stacked 85% of 17 Images ISO 800 180 Sec, 24 DARK @ 120 Sec, 32 BIAS, 12 FLATS, Post-processed with Adobe Photoshop CS6 Telescope - Apogee OrthoStar LOMO 80/480 with Hotech SCA Field Flattener, Hutech IDAS LPS-P2 filter, Baader BCF modified Canon 70D DSLR field 106' x 159' , Ambient 17-16C. EQMOD EQASCOM with Ascom 6 for mount control. Backyard EOS Pro 3.0.3 for Image acquisition. Mount - Skywatcher NEQ6 Pro. Guidescope - Orion ShortTube 80 with Starlight Xpress SuperStar (Mono) CCD Auto Guider and Stark Labs PHD auto guiding software.
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