Popular Post Bottletopburly Posted January 30, 2022 Popular Post Share Posted January 30, 2022 Leo triplet , 70mm refractor, zwo533mc processing in startools 4.1hrs Sheila, +seven_legs, +Graham and 6 others 9 Link to comment Share on other sites More sharing options...
Stephen Posted January 30, 2022 Share Posted January 30, 2022 They are a great image and detail David Bottletopburly 1 Link to comment Share on other sites More sharing options...
+RonC Posted January 30, 2022 Share Posted January 30, 2022 Agreed, lots of detail there David 👍 Bottletopburly 1 Link to comment Share on other sites More sharing options...
+Graham Posted January 30, 2022 Share Posted January 30, 2022 Nice one David. I di a run on this target myself in the early hours of this morning. Bottletopburly 1 Link to comment Share on other sites More sharing options...
+Glafnazur Posted January 30, 2022 Share Posted January 30, 2022 Nice image David, good colour on the galaxies and another of my many favourites 👍 Bottletopburly 1 Link to comment Share on other sites More sharing options...
Bottletopburly Posted January 30, 2022 Author Share Posted January 30, 2022 Had a better play had to redo flats and seemed to work better +Glafnazur and Clive 2 Link to comment Share on other sites More sharing options...
Clive Posted January 30, 2022 Share Posted January 30, 2022 Not sure which I prefer, I think the stars look better on the second but the galaxies better on the first? Bottletopburly 1 Link to comment Share on other sites More sharing options...
BAZ Posted January 31, 2022 Share Posted January 31, 2022 Not bad for a 70mm frac, just shows what can be done with modest gear. Bottletopburly 1 Link to comment Share on other sites More sharing options...
Bottletopburly Posted January 31, 2022 Author Share Posted January 31, 2022 On the first set of flats there was some issues with dust bunnies /blotchiness that wasn’t being corrected so I was looking for an adu 25000 value but with a 2sec exposure, so two layers of cotton over scope and use a tablet as light source came out at 7 sec using Apt flats aid too long so increased brightness slightly and got 2.3 sec and that flat worked I could also see the anomalies on the flat produced this time so maybe something to watch out for as flats are the biggest pain but knowing I could see the anomalies gave me an inkling it would work, previous flat was too short of an exposure at around 0.5 sec I think , reading comments on flats 2-3 sec on the cmos cameras seems to be the sweet spot with an adu of 25000. Link to comment Share on other sites More sharing options...
Clive Posted February 1, 2022 Share Posted February 1, 2022 I thought that the ZWO533MC was a 14 bit camera, so why were you aiming for 25000 ADU for your flats? Link to comment Share on other sites More sharing options...
Bottletopburly Posted February 1, 2022 Author Share Posted February 1, 2022 2 minutes ago, Clive said: I thought that the ZWO533MC was a 14 bit camera, so why were you aiming for 25000 ADU for your flats? It’s full well is 50 k they say roughly half full well 25 k some use 30k , Link to comment Share on other sites More sharing options...
Clive Posted February 1, 2022 Share Posted February 1, 2022 48 minutes ago, Bottletopburly said: It’s full well is 50 k they say roughly half full well 25 k some use 30k , The ZWO533MC full-well capacity is 50k electrons but the maximum output from its 14 bit ADC is only 16383 ADU so if you're measuring the ADU of images I would expect to aim for 7000 to 9000 ADU (but perhaps your measurement software assumes your camera specifications and converts the image ADU values to electrons?) Link to comment Share on other sites More sharing options...
Clive Posted February 2, 2022 Share Posted February 2, 2022 It suddenly struck me that the camera probably muliplies its 14 bit ADU value by 4 to create a pseudo 16 bit value for the FITS file (so halve scale would be about 32k ADU). Bottletopburly 1 Link to comment Share on other sites More sharing options...
Bottletopburly Posted February 4, 2022 Author Share Posted February 4, 2022 On 02/02/2022 at 08:46, Clive said: It suddenly struck me that the camera probably muliplies its 14 bit ADU value by 4 to create a pseudo 16 bit value for the FITS file (so halve scale would be about 32k ADU). Confirmed by ivo at APT , camera driver scales to 16 bit ivo measured a 15 sec exposure Adu value of 65,535 . Link to comment Share on other sites More sharing options...
Clive Posted February 4, 2022 Share Posted February 4, 2022 3 hours ago, Bottletopburly said: Confirmed by ivo at APT , camera driver scales to 16 bit ivo measured a 15 sec exposure Adu value of 65,535 . Well don't use those as flats! 😆 Link to comment Share on other sites More sharing options...
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