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peter shah

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Everything posted by peter shah

  1. those sony cameras are super sensitive, big pixels....I wonder how good the new one will be ....Surprising only a few frames...it shows less noise with three short stacked frames than one long one.....still difficult to process
  2. Sorry....yes 10000iso ....my Spanglish kicking in again.
  3. Snapped this on my recent visit to Spain. Exposure time was 3x13s on my Sony A7s iso was 10000 darks and flats applied , 20mm Canon prime lens at f4. I didn't have a tripod with me so I had to balance the camera on a cardboard box. Thanks for looking
  4. Beautiful set of images Goran....great star colour
  5. Love the colour rendition, detail is lovely. Shame about the reflections hopefully you'll get to the bottom of the issue..
  6. another corker Olly....stunning star colour processed with your usual delicate touch.
  7. Oooo that's lovely Adam. Nice natural processing.
  8. Drift is drift and so linear, when you dither its random so wont appear in a line..... If you have this striation pattern showing in you image then dithering is not enabled or not set high enough..
  9. normally caused by drift in your subs so when you align your frames the noise pattern appears in the direction of drift. So when you dither your guiding after every exposure, when you align your frames the noise is placed randomly in the FOV in relation to the signal so you no longer see the pattern
  10. A beautiful image.... The diagonal grain is caused by noise pattern. To avoid this in the future dithered guiding will completely resolve the issue.
  11. Not easy to do LRGB broadband and for a first go that aint bad. I think slightly over saturated overall and a little background colour cast, presumably from a bit of LP, but all pretty easy tweaks to do.....great job
  12. Thank you for your kind words chaps
  13. another delight Peter, great shot
  14. beautiful....perfect scale and amazing detail
  15. Very tasty set up Olly, all that data in half the amount of time, a dream come true and as always super impressive results.
  16. that is some achievement with eyepiece projection..... well done
  17. lovely shot....super tight stars,
  18. super detail.... great scale too
  19. always nice to get your first finished....great job
  20. Here is a single frame uncalibrated to give you an idea of the sort of signal I'm getting from 1x600s binned 1x1. Iv'e only done curves stretches in Photoshop. F3.8 with 9un pixels
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