geordie85 Posted May 29, 2019 Share Posted May 29, 2019 I've ordered a qhy183m to accompany my qhy183c and I'm wondering if I'd be able to use the same dark frames from the qhy183c for the qhy183m? Not that it'll make too much difference if I need to make a new darks library as we get plenty of cloudy nights here. Link to comment Share on other sites More sharing options...
vlaiv Posted May 29, 2019 Share Posted May 29, 2019 No, unless you want to end up with messed up calibration. Each sensor is different in terms of bias and dark current. In part these are based on manufacturing defects / quirks of each chip and are a bit like finger print. Some things in darks are general feature of the sensor line - like position/shape of amp glow, but each of individual sensors will produce slight variations in intensity / shape and that will cause problems with calibration. Link to comment Share on other sites More sharing options...
MarsG76 Posted May 29, 2019 Share Posted May 29, 2019 I second that... I'd say no... different sensor, different age, color and mono will result in a different Dark frame pattern. Link to comment Share on other sites More sharing options...
geordie85 Posted May 29, 2019 Author Share Posted May 29, 2019 I thought as much. Thanks for the confirmation Link to comment Share on other sites More sharing options...
Adam J Posted May 30, 2019 Share Posted May 30, 2019 On 29/05/2019 at 14:52, geordie85 said: I thought as much. Thanks for the confirmation I agree with the above but it might be interesting to try it and see the result. Link to comment Share on other sites More sharing options...
geordie85 Posted May 31, 2019 Author Share Posted May 31, 2019 On 30/05/2019 at 20:03, Adam J said: I agree with the above but it might be interesting to try it and see the result. Well my camera arrived yesterday whilst I was at work. I put it on my flt98 earlier today and if the forecast remains true I'll be able to test it tomorrow. I'm not holding much hope for the forecast though. Link to comment Share on other sites More sharing options...
ollypenrice Posted June 1, 2019 Share Posted June 1, 2019 If you want to see what the wrong darks do to your calibration you can try just rotating a master dark by 180 degrees, saving it and then applying it to a set of lights. It will make a mess. Olly Link to comment Share on other sites More sharing options...
Adam J Posted June 1, 2019 Share Posted June 1, 2019 10 hours ago, ollypenrice said: If you want to see what the wrong darks do to your calibration you can try just rotating a master dark by 180 degrees, saving it and then applying it to a set of lights. It will make a mess. Olly I was more interested in if the amp glow was idenitcal, it's a given that hot pixels etc will be in the wrong place. Just curiosity as in theory hot pixels and minor defects will be removed by dithering but amp glow will not be. Link to comment Share on other sites More sharing options...
geordie85 Posted June 1, 2019 Author Share Posted June 1, 2019 1 hour ago, Adam J said: I was more interested in if the amp glow was idenitcal, it's a given that hot pixels etc will be in the wrong place. Just curiosity as in theory hot pixels and minor defects will be removed by dithering but amp glow will not be. I will give it a go once manage to get an imaging session in, just for fun. Last night I managed to polar align, focus and get my spacing (almost) right (which happened to be on my first attempt) and four 10 second subs before clouds stopped play. Link to comment Share on other sites More sharing options...
Adam J Posted June 1, 2019 Share Posted June 1, 2019 2 hours ago, geordie85 said: I will give it a go once manage to get an imaging session in, just for fun. Last night I managed to polar align, focus and get my spacing (almost) right (which happened to be on my first attempt) and four 10 second subs before clouds stopped play. No need for imaging, just subtract one dark from the other and see whats left using identical settings. Link to comment Share on other sites More sharing options...
geordie85 Posted June 2, 2019 Author Share Posted June 2, 2019 1 hour ago, Adam J said: No need for imaging, just subtract one dark from the other and see whats left using identical settings. I haven't taken any darks with the qhy183m yet. Busy at work. I will do when I get the chance though Link to comment Share on other sites More sharing options...
kirkster501 Posted June 5, 2019 Share Posted June 5, 2019 What laptop is that please? Link to comment Share on other sites More sharing options...
geordie85 Posted June 5, 2019 Author Share Posted June 5, 2019 19 minutes ago, kirkster501 said: What laptop is that please? Alienware m17 r2 Link to comment Share on other sites More sharing options...
Adam J Posted June 6, 2019 Share Posted June 6, 2019 9 hours ago, geordie85 said: Alienware m17 r2 Expensive laptop to damage with dew...take care. Link to comment Share on other sites More sharing options...
geordie85 Posted June 6, 2019 Author Share Posted June 6, 2019 6 hours ago, Adam J said: Expensive laptop to damage with dew...take care. I do cover it when it's cold or I'm out doing a long imaging session. Link to comment Share on other sites More sharing options...
alan potts Posted June 6, 2019 Share Posted June 6, 2019 Thats a great shame, the best thing I have ever seen is from Backyard Astronomer, a large plastic storage box turned on its side with holes for the cables. Alan Link to comment Share on other sites More sharing options...
geordie85 Posted June 22, 2019 Author Share Posted June 22, 2019 For those who are interested, it didn't work. It didn't take out the amp glow, but left it looking really weird, noise everywhere along with hot pixels and the image was a complete mess. It was interesting to try though. Link to comment Share on other sites More sharing options...
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