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moonrocks last won the day on September 24 2016

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  1. NGC 7822 The cosmic question mark.

    This summer was far better than last Ray. I am sorry to hear the weather down under has been poor for astro Quite frustrating. Hi Brent , many thanks for your comment ! I am glad you enjoyed the colour palette. The the beauty of narrow-band photography is that the palette is individual to the person processing the image and this is what makes NB imaging so exiting and unique. Each of us would get a different result even with the same data.
  2. The whole Heart

    Wow, that is a belter Greg! Fantastic image my friend!
  3. Caph revisited

    Very accomplished work Greg! An excellent star field!
  4. NGC 7822 The cosmic question mark. by Paul C. Swift, on Flickr The cosmic question mark panarama A turbulent ring of dust and gas frozen in time like some fossilized explosion, hovers motionless in Cepheus. A memory of a dying star spanning some 80 light-Years. Cederblad and the surrounding nebula clouds begin to emerge through the gloom of Valencia's urban skies. This is a three panel mosaic revealing the cosmic question mark. NGC 7822 can be found at the edge of a giant molecular cloud in Cepheus and lies approximately 3,000 light-years away from our home planet. Imaging telescope: Vixen VSD 100 f/3 Imaging camera: 9.2mp Sony SX814 Mount: Software Bisque Paramount MX Guiding telescope or lens: Vixen VSD 100 f/3 Filters: Chroma SII 3nm, Chroma OIII 3nm, Chroma Ha 3nm Accessories: Chroma OIII 3nm, Chroma Ha 3 nm Resolution: 6959x3333 Dates: Oct. 3, 2016 Frames: 172x1800" Integration: 86.0 hours Avg. Moon age: 1.81 days Avg. Moon phase: 3.67% Astrometry.net job: 1266045 Locations: Home observatory, Valencia, Spain
  5. Many thanks Shane, glad you found it interesting. The subject touches on an issue that seems to effect many of us at one time or another.
  6. Layers are used for many reasons, for example, one might use layers for local contrast enhancement. This is where you treat an isolated area of the image on a duplicate layer and then blend it though to the master layer using masks. This one of many powerful aspects of Photoshop.
  7. That is a good question and one that I am constantly working on! Like all processing in astro trial and error is key, along with close observation of the effects of any applied treatments in PI or PS. .Using the super powerful "curves tool" in PS or PI, one can introduce contrast and dramatically effect the contrast ratio of an image. The idea is to contain as much visual information (like faint nebular structure) as is possible between black and white while maintaining visual interest and excitement. As a rule of thumb the non nebular containing background areas should never be 100% black. Rather a kind of charcoal tone. Each image will have it's sweet spot and as an astrophotographer you need to find it! Some people live and die by the histogram but I feel it should only be used as a rough guide.
  8. This is a tip for beginners starting out in wonderful world of astrophotograpy and processing for the first time. Newcomers to processing often hype-up the contrast in an attempt to create a more dramatic look. We all did this at some point! Although this sometimes has the intended effect, it also can destroy the fine nebular detail that resides in those darker areas. This image illustrates the lost of fine detail that can occur when contrast is increased. The ill effects are especially apparent in the upper areas of these panels. Panel A: The levels are set for maximum detail throughout the tonal range. Panel B: Contrast added and the blacks begin to fall. Panel C: The blacks are now crushed and the loss of detail becomes apparent.
  9. AAPOD2_20150504.jpg

    Outstanding work kohamher !
  10. Cygnus "LifeSpring"

    Many thanks Greg and Shane! Glad you found it interesting
  11. Cygnus "LifeSpring"

    That is Abell 71 (Pk 85+04.1) is a also a planetary nebula, however it is well known and has been imaged by many. The PN, I was surprised by, ( Weinberger 1-10) is one that few people have seen or know about which was why it was so exiting to see and investigate it for the first time. It's visible faintly in DSS data and has an entry at Simbad as PN G086.1+05.4