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I have been using a 1 1/4 inch UHC filter but this had been causing bad vignetting that was difficult to remove during processing. So, I left out the filter so there was a 'straight 2"' opening into the camera. However, the light pollution meant that 45 s was the maximum exposure. Anyway, I took 65 x 45s of Orion and 165 x 45 s of the Crab - one looks good (for me ) and one looks bad, even for me ! I tried the processing several times but this was the best I could do. So, the advice I am after is, is the poor image of the crab due to the nature of the nebula? my camera is unmodded.
The Great Nebula in Orion ( Messier 42, NGC 1976 ) ( tap on image to see larger ) Scrapbook page ... Details: The Great Orion Nebula (Messier 42, Messier 43, NGC 1976 ) in the Orion Constellation RA 5 36 15, DEC -5 26 31 ( 2016.9 ) Skywatcher Quattro 10" f4 Newtonian telescope Skywatcher AZ Eq6 GT Mount Orion Short Tube 80mm guide scope & auto guider - PHD2 Baader MPCC Mark 3 Coma Corrector & no filter Nikon D5300 (unmodified) Field of view (deg) < ~ 1.35 x 0.90 long exp noise reduction on 45 x 120 sec ISO 400, 15 x 60 sec ISO 100, +various short exposures 3 to 15 sec to extend dynamic range for bright stars Pixinsight & Photoshop 28th November 2016
Astrophotography Scrapbook Vol. 1 Cover Page Lagoon Nebula in Sagittarius ( Messier 8, NGC 6523 ) The Fighting Dragons of Ara ( NGC 6188 ) War and Peace in Scorpius ( NGC 6357 ) Spiral Galaxy NGC 6744 in Pavo Ptolemy's Cluster in Scorpius ( Messier 7, NGC 6475 ) A Million Stars in the Deep South ( NGC 104, 47 Tucanae ) A Wishing Well in Carina ( NGC 3532 ) A Beehive in the Southern Sky ( NGC 2516 ) The Sliver Coin in Sculptor ( NGC 253 ) The Great Nebula in Orion ( Messier 42, NGC 1976 ) A Cluster of Pearls in Centaurus ( NGC 3766 ) - new 5 Dec resources: Scrapbook Template ------------------------------------- When I show my astrophotography images to my friends and family they invariably want to know what they are looking at. This led me to wonder if there was a way I could display my images on a single page together with a few notes on the target object as well as few technical details of the capture for those who might be interested. What I came up with a "scrapbook" like page that combines all of these three elements in a single PDF sheet ( or jpeg image) that ultimately I might combine together to form a PDF book that I can share online or send to friends and family. In the meantime, I thought I might post in this thread each page of my work-in-progress towards volume 1 of my Astrophotography Scrapbook. Any and all comments, observations, suggestions and constructive criticisms will be warmly received. Cheers Mike ps. The pages have been sized to fit full screen on an IPAD
So we had some fine weather overhere in The Netherlands during the past 3 weeks, and I took full advantage of the clear nights arounbd the full blood moon (which for me was eclipsed not by the Earth's shadow but by grey clouds as I live in the only part of the country that did not have a clear night during the eclipse) and shot some lovely Ha data of NGC6914 (awaiting processing) and Messier 42 during the second part of the night. The Ha data comprises 7 and half hours of 10 min subs at ISO800 with the Canon 350D/8"Newt, calibrated with darks, flats and bias in DSS and processed in PS CS3. Last weekend, we again had lovely clear nights, and so I shot some RGB data on the Canon 350D/8" Newt combo as well. Also imaged M33 during those nights while waiting for M42 to rise, but again that data still awaits processing. The RGB image consists of 6 hours 25 min of 5 min subs at ISO800, calibrated with darks, flats and bias in DSS and processed by the DSLR-LRGB method in PS CS3. I had wanted to add the Ha data to the RGB image, but for now, it doesnt seem to significantly improve the image, so I just left it out. Hope you enjoy these images, I do, as it was the first time I could image M42 with it not moving through the trees every couple of hours. Great to have my LOMO observatory on my balcony.