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Hello all, I am trying to process data captured on friday during almost full moon, and I'm having a hell of a time of it.. Due to the full moon doing it's best sun impression my target was an open cluster (NGC 225 in Cassiopea), thinking it would be doable. I was using my 2" Explore Scientific CLS filter, my unmodded Nikon D7100 and captured 92 usable 45 second subs at ISO 400. Calibrated with bias and flat frames and stacked with linear fit clipping as the pixel rejection algorith. The mission for the night was not getting particularly good data, but getting decent tracking and round stars, something I have had lots of trouble with! Now that I am trying to process it, I find im dealing with some very nasty gradients / casts and I can't seem to get any good colors. An initial strech reveals a strong blue color cast/gradient that I can deal with in a number of ways. Linear fit DBE ABE followed by the usual: SCNR (green) Color Calibration No matter what I do I end up with the whole image being either really green or really red and not much else for color in any of the stars. I also think i burned out all the major stars by over saturation.. I know the CLS filter is going to wreak havoc on colors because it completely blocks parts of the spectrum, so maybe the CLS filter is just the wrong tool for the job? If anyone would like to show me what they can get from this data, and how (so preferably with PI) I would be really grateful. At the moment im thinking maybe the data is just really bad and not useable? Linked is the final integrated xisf (only xopped slightly): https://www.dropbox.com/s/nmxds87toc7vz51/integration.xisf?dl=0
Hello there StarGazers or shall I say CloudGazers! Hahahaha! I'm sorting out an auto guiding rig for when the clouds vanish eventually. I'm using the Raspberry PI Model 2 with Lin_guider. I'm after either the following CCD's: QHY5L-II Mono or ZWO ASL120MM Mono Let me know if you have any spare or have recently upgraded. I was going to go with an Altair Astro mono GPCAM but currently there is no support from lin_guider or Linux drivers as of yet. Thanks all!
Finally got round to starting a proper mosaic in SGP, and putting skills in PI into practice from Warren Keller's excellent book! This is not a fully processed image by any means, just a 1st attempt at the alignment workflow for the mosaic. T: Skywatcher ED80 M: EQ6-AZGT C: AtikOne G: AtikGP F: Luminance E: 4 panes, each 6 x 300s; fov for each pane is 1.19 deg x 0.95 deg; Basic Process in PI: Calibrate Cosmic Correction Star Align Image Integration Crop ABE Star Align for Mosaic ABE Histogram Curves So, pleased with the outcome - cannot see the seam at all. Yes, the data is noisy - rejection needs tweaking and needs heaps of data, but the workflow for creating the mosaic makes sense having run through a few times tonight!
I read and enjoy this form a lot. I wish I was able to post more (some) content, but I haven't been out for ages. Anyway got out last hight determined to get 1499. Started out taking 200 sec subs with my un-modded 7D. Then mister Moon came out to play, so decided to reduce the exposures to 100 secs (not really sure if that was a good strategy? Anyway here's the result of stacking in DSS (i'm not a fan of DSS but it seemed to have been good to me this time) and a histogram stretch in PI. PA: using Alignmaster Captue: BYE Comments and criticism welcome.