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Hi folks, Another reprocess of old data (from last December) to see if my skills have improved. Here's one which includes the Flaming Star nebula, rather deeper than my previous effort: Flaming Star - includes M36, M37, M38, IC 405, IC 410 and IC 417 The full sized 4096 pixel square version is available here (6 MB download) - beware, horrors may await the avid pixel peeper! The challenges for this one were to separate out the faint Ha from some residual sensor noise and to decide how many stars were enough - there were a lot more in the RGB subs. At the image scale offered by the 165mm focal length lens the reflection nebulosity was difficult to extract. I decided where it was by doing a blink comparison of the 1000 second blue stack with the full RGB image (the version with all the stars plus some nebulosity) and then it was a matter of isolating it from the bright stars that were illuminating it. It was added to the Photoshop stack of Ha (no stars) plus RGB (just stars) and the final challenge was deciding how strongly to show it - the reflection nebulosity should certainly be weaker but then it risks geting lost in the artificially strong Ha signal. Something that I didn't find in the original processing of the data last year is the "sugar cage" just creeping in at the bottom of the image at about six-thirty. Has anyone got a shot of the full object? Bob. Shooting Information: 8 x 1000 seconds exposures of Ha 5 x 200 seconds through each of Red, Green and Blue 3 x 1000 seconds through the Blue filter for reflection nebulosity Camera: FLI ML16803 cooled to -25°C. Lens: 165mm focal length f/2.8 Pentax medium format Pointing at: 5h 25m, +34° 30'
Well last night was one of those rare nights where it all comes together. The weather, equipment, guiding and everything in between. I intended to stick with just the one target but got carried away with the excellent conditions and ended up starting 4 Anyway after 10 hours over 23/11/14 and 24/11/14 heres what I have so far. Thanks for looking. Usual stuff: SW Equinox 80 APO, EQ5 Pro Synscan GOTO. Guiding: SW 9x 50 finder guider and QHY5. Modded Canon 600D and coma corrector with CLS clip filter. Using: BYEOS, PHD, DSS, Photoshop CC. M42 - Orion Nebula - Finished Image ISO 400 5 X 300 second light frames 6 x 600 second light frames 15 x 30 second light frames 10 x 10 second light frames 40 x Flats 20 x Bias 20 X Darks M42 ORION NEBULA DSLR by VikN46, on Flickr M1 - Crab Nebula ISO 400 6 x 600 second light frames 40 X Flats 20 x Bias 20 X Darks M1 CRAB NEBULA 1.1 by VikN46, on Flickr M1 CRAB NEBULA CROP DSLR by VikN46, on Flickr IC 405 - Flaming Star Nebula ISO 400 10 x 600 second light frames 1 x 1200 second light frames 40 x Flats 20 x Bias 20 X Darks IC 405 Flaming Star Nebula by VikN46, on Flickr AND FINALY.. IC 434 - Horsehead Nebula ISO 400 5 x 600 second light frames 40 x Flats 20 x Bias 20 X Darks IC 434 HORSE HEAD NEBULA DSLR by VikN46, on Flickr
After hours of stacking 360 subs with PI, stitching and processing in PS, I finally have the result from the little Samyang 135 f/2 from both before and after the meridian flip from Saturday night's triple rig session. Totally 360 x 1 min, so 6 hours (with a Canon 60D at ISO1600). Like with the 300 mm scope it became an accidental mosaic as the image had shifted quite a bit after the flip. So, a a kind of wide wide-field image. My previous post of the images from this session is here: Comments and suggestions most welcome as always! Cheers Göran