JamesF Posted August 2, 2013 Share Posted August 2, 2013 This is a (WIP) RGB image of M13 from last night. My first ever RGB image Am I correct in assuming that the bright red, green and blue pixels near the top of the frame and to the right of the core are due to hot pixels my 314L+?James Link to comment Share on other sites More sharing options...
rfdesigner Posted August 2, 2013 Share Posted August 2, 2013 probably.. if your guide point changes from shot to shot and colour to colour then you might get what you've got here.If you've guided the whole lot on one star and it hasn't moved across the guide cam, then I would expect little RGB stripes very close together.Derek Link to comment Share on other sites More sharing options...
JamesF Posted August 2, 2013 Author Share Posted August 2, 2013 This was completely unguided.James Link to comment Share on other sites More sharing options...
rfdesigner Posted August 2, 2013 Share Posted August 2, 2013 Hot pixels it is then.Sigma should help, as would a hot pixel map Link to comment Share on other sites More sharing options...
mallorcasaint Posted August 2, 2013 Share Posted August 2, 2013 I would say they were hot pixels. I sometimes get them on my 314L but RC Astros Maxim DL filter takes them out! Link to comment Share on other sites More sharing options...
JamesF Posted August 2, 2013 Author Share Posted August 2, 2013 Back to stage 1 then James Link to comment Share on other sites More sharing options...
mallorcasaint Posted August 2, 2013 Share Posted August 2, 2013 What temperature did you image at? I found that my HP's disappeared once the temp went below -10. Link to comment Share on other sites More sharing options...
JamesF Posted August 2, 2013 Author Share Posted August 2, 2013 I had it set to 0.5C as the ambient temperature was over 22C when I started.James Link to comment Share on other sites More sharing options...
mallorcasaint Posted August 2, 2013 Share Posted August 2, 2013 I would say that is nowhere near enough James. As it is "set point" cooling set it to -10 or 15 for best results. Link to comment Share on other sites More sharing options...
rfdesigner Posted August 2, 2013 Share Posted August 2, 2013 If you take a dark frame at 0.5C then use that to generate a hot pixel map, you can deal with anything showing through.Agree with the 'low as you can' philosophy though Link to comment Share on other sites More sharing options...
JamesF Posted August 2, 2013 Author Share Posted August 2, 2013 I shall try a lower setpoint next time in that case. In the meantime it looks like sigma stacking has sorted it James Link to comment Share on other sites More sharing options...
SnakeyJ Posted August 2, 2013 Share Posted August 2, 2013 nice natural looking colour in that image James (other than the odd hotpixels), though suspect this would benefit from more subs to reduce the noise (appreciating this is a test run) I'm sorely tempted to get one of these cameras and Bazza's just re-dangled the carrot that I managed to avoid earlier in the week! From what I've read the published max deltaT is a little conservative, so -5 should be easilly achievable from an Ambient air temp of 22, but I'd push it as low as you can get it at this time of year.Are you looking to setup the zwo for guiding with this? Link to comment Share on other sites More sharing options...
JamesF Posted August 2, 2013 Author Share Posted August 2, 2013 More frames would have been good, but the clouds had other ideas. Fortunately I was rotating through the filters doing a few of each at a time, so I didn't end up with L (not in this image) and R, but only a few G and no B I've not really got my head around what I'm going to do as regards guiding yet. The 120MM is the obvious choice of the kit I already have which is a big point in its favour, certainly. I was planning on sorting all this stuff once I had an obsy, but construction didn't happen last summer mainly because it was so wet, and now it's a prickly subject with "her indoors" who wants stuff finishing around the house before I embark on another project James Link to comment Share on other sites More sharing options...
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