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  1. The Sculptor or Silver Coin Galaxy ( NGC 253 ) in the Sculptor constellation - re-processed from the original subs The Sculptor Galaxay ( NGC 253 ) ( Please click / tap on image to see larger and sharper ) .................... The Silver Coin Galaxy ( NGC 253 ) in the Sculptor constellation ( aka the Silver Dollar or Sculptor Galaxy ). Caroline Herschel in 1783 was the first to recordthis bright ‘nebula’ in an area of the southern sky that Nicolas de Lacaille had called the “Apparatus Sculptoris” or “the sculptor’s studio”. Whilst relatively close to us compared to the billions of far more distant galaxies in the Universe, the great size of the “Sculptor Galaxy” and the huge distances involved are still hard to comprehend. To put this into some perspective, the light that is just now reaching one edge of the great disc left the opposite edge when the Earth was in the grip of last great Ice Age 70,000 years ago and the light we now see has been travelling towards us for over 11 million years. Details: NGC 253 - "Silver Coin" or "Sculptor" galaxy. Catalogue location: RA 00 48 23, DEC -25 11 52. From Image Solver: Image centre: RA 00 47 33.4 Dec. -25 17 11.1 Focal length: 1008.5 mm Field of view: 1d 19' 2.2" x 53' 0.3" 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. 20 x 180 sec ISO 800, long exp noise reduction on. Pixinsight & Photoshop. November 4, 2016 re-processed from original subs ( including Photometric Colour Calibration ) - September 9, 2017 ........... Details of Sculptor Galaxy from SkySafari for the 4th of November 2016 around 10pm local time ............. Annotated version ( using Pixinsight ImageSolver and Annotation scripts ) Sculptor Galaxy ( NGC 253 ) - annotated The cyan tags ( 35 or so ) relate to galaxies recorded in the Principal Galaxies Catalogue. The white tags are brighter stars as recorded in the Tycho-2 Catalogue. The number beneath is the magnitude of the referenced star. .......... Link to previous version below ...
  2. Hi guys, I have a Canon D550 (T2i) which by pure fluke seems to be one of the few Canon cameras which is ideal for imaging planets using the video recording cropped 640 video size frames setting. I've read up on techniques etc but if really like a book as a reference to read up further on the subject but am finding most are either dedicated to deep space objects with a full guided set up or only have a small chapter and is more aimed towards the set up than any techniques etc. I have found the e-book A guide to DSLR planetary imaging by Jerry Lodriguss and it seems exactly what i want but it is only avaiable from the US and costs over £50 before VAT is calculated. Not paying that. The other consideration is Every photon counts which is highly rated on here but again I'm concerned on how much if the content will actually be focused on planetary imaging with a DSLR. Any input and opinion will be extremely welcome. Adaaam75 I have a Canon 550D with a Celestron 9.25SCT on an AVX mount (including adaptors!).
  3. Hi - it used to be the case that astrophotographers using DSLRs generally preferred Canon technology to Nikon because of the lower noise Canon sensors. However benchmark tests with organisations like DSomark.com seem to favour many Nikon cameras over Canon and in some of the tests I've seen certainly some of the full frame Nikons appear to deliver images with a lot less noise. If we are focussed on recovering detail in the shadows in post production, much the same as "daylight" photographers, then is Nikon now leading Canon or are there other factors to take into account. Thanks in anticipation of your help.
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