rfdesigner Posted March 1, 2011 Share Posted March 1, 2011 Well I've now got the M51 data to process and I'm quite pleased..This is a stack of the best 100 images, all 5second subs. So total imaging time is still only about 8 minutes.Sadly I lost about 300 frames due to misting up and another 100 when a neighbours searchlight sneaked in a crack in the dewshield.Really must get myself a heater to stop the dew.I used darks, biases and flats to maximise the sensitivity, each one from a stack of 16 frames.This just goes to show how bright M51 is.Other details:Camera: Lodestar Scope: 12"f5 newt mount: Fullerscope MKIVFilters: Nonethanks for looking Derek Link to comment Share on other sites More sharing options...
svetimas Posted March 1, 2011 Share Posted March 1, 2011 Looks nice. But somewhat I am used to watch it flipped horizontally Link to comment Share on other sites More sharing options...
Digz Posted March 1, 2011 Share Posted March 1, 2011 Only 8mins, crikey it is a bright sucker! Link to comment Share on other sites More sharing options...
airprox Posted March 1, 2011 Share Posted March 1, 2011 That truely is splendid! I like it a lot... 5 sec subs, blimey, I was having to use 30 sec with my ST120... mind you, I'm guessing the camera had something to do with it too ;-)CheersAlun Link to comment Share on other sites More sharing options...
rfdesigner Posted April 3, 2011 Author Share Posted April 3, 2011 I had a go at re-processing this one. I'm now much more happy with it as I've managed to maintain the core detail, show up a bit more in the arms and still see the background. I also magaged to manipulate the FWHM down to about 1.7 arc seconds by enlarging all the subs 2x2 pre-stacking, not bad for 1.1 arc second pixels. I don't know who exactly Richarson or Lucy are, but their deconvolution algorithum is very useful.DerekProcessed in IRIS:1. sub bias & dark (mostly bias with 5 second subs)2. divide by flat.3. double size 4. order subs by best strehl ratio.5. coregister (multistar automatic registration) first 90% of images (best 90% by strehl)6. statistically stack, removing outlying pixels limit set to +/-3 sigma from average, removes all sorts of muck.. including satellites, hot pixels and cosmic rays.7. deconvolve using a large number of gentle itterations.8. subtract what's left of the sky.9. play with curves. logs etc.10. crop flip / rotate. Link to comment Share on other sites More sharing options...
svetimas Posted April 5, 2011 Share Posted April 5, 2011 Nice, it now has no burn out centers, I like that. Link to comment Share on other sites More sharing options...
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