Popular Post +Graham Posted October 6, 2021 Popular Post Share Posted October 6, 2021 After the other nights disaster when the rig got soaked in a sudden downpour resulting in the usb hub checking out. I liberally applied a moisture repellent all over. Tonight I fired up the Obs to see what was what and to my relief everything came back on and worked perfectly. This M 27 is the result of 187 subs at 45 seconds. Half at ISO 1600 and the other half at ISO 3200. Taken with the 10 inch RC and the Canon 1100 D. Captured in BYE Stacked in DSS with no calibration subs ( I really must get around to doing some ) Quick polish up in PS 6. Bottletopburly, +seven_legs, philjay and 7 others 10 Link to comment Share on other sites More sharing options...
BAZ Posted October 7, 2021 Share Posted October 7, 2021 Nice shot Graham, I never get bored seeing this one. +Graham 1 Link to comment Share on other sites More sharing options...
+Graham Posted October 7, 2021 Author Share Posted October 7, 2021 Thanks Martyn. It was a relief to get the rig up and running again. Link to comment Share on other sites More sharing options...
+RonC Posted October 7, 2021 Share Posted October 7, 2021 Looks fine without calibration subs! 👍 +Graham 1 Link to comment Share on other sites More sharing options...
+Glafnazur Posted October 7, 2021 Share Posted October 7, 2021 Looking good Graham 👍 +Graham 1 Link to comment Share on other sites More sharing options...
philjay Posted October 7, 2021 Share Posted October 7, 2021 Nice, good image scale +Graham 1 Link to comment Share on other sites More sharing options...
DeanWatson Posted October 7, 2021 Share Posted October 7, 2021 Lovely example, must revisit this myself. Getting a tad late in the year but might be able to squeeze it in. BAZ 1 Link to comment Share on other sites More sharing options...
Peter Shah Posted October 7, 2021 Share Posted October 7, 2021 A slight issue with star colour but that aside its a very natural looking shot...I really like it Link to comment Share on other sites More sharing options...
+Graham Posted October 7, 2021 Author Share Posted October 7, 2021 1 hour ago, Peter Shah said: A slight issue with star colour but that aside its a very natural looking shot...I really like it I pushed the processing a little too far Peter. I might have a go at running this through Pixinsight to see what I can come up with. Link to comment Share on other sites More sharing options...
+Graham Posted October 8, 2021 Author Share Posted October 8, 2021 I have reprocessed this with the addition of calibration frames. DSS Image. A bit on the harsh side after converting to JPEG to load up on here. The TIFF was a lot lot smoother. Pixinsight Image. This needs a lot more work and someone who knows what they are doing in Pixinsight. I would like to get rid of the Halos and the gradients. It is a huge image that only full res can do it justice. So do the click on image thing to get there. +Glafnazur 1 Link to comment Share on other sites More sharing options...
Clive Posted October 8, 2021 Share Posted October 8, 2021 Are they the same data? Is the first stacked in DSS and processed in PS and the second stacked and processed in PI? Their is a hint of a gradient in the first image but is the second more stretched than the first (also causing the halos to appear) revealing artifacts not removed by the calibration images (or added perhaps)? Link to comment Share on other sites More sharing options...
+Graham Posted October 8, 2021 Author Share Posted October 8, 2021 1 hour ago, Clive said: Are they the same data? Is the first stacked in DSS and processed in PS and the second stacked and processed in PI? Their is a hint of a gradient in the first image but is the second more stretched than the first (also causing the halos to appear) revealing artifacts not removed by the calibration images (or added perhaps)? Yup same data. Exactly as you stated. Image 1 - DSS and PS 6. Image 2 - PI. Did not do a lot with the PI image after the many hours it took to calibrate and align the 178 lights my eyes were going square and my head was starting to hurt 😂 Link to comment Share on other sites More sharing options...
Clive Posted October 8, 2021 Share Posted October 8, 2021 Hours to calibrate and align? I would guess even with a slow PC with limited memory (like mine) DSS would do that number of subs in a few tens of minutes. With that small field of view, I wouldn't expect even the worst light polution to create such a large gradient, so I just wonder if your calibration images are actually causing problems? What calibration images did you use? Link to comment Share on other sites More sharing options...
+Graham Posted October 8, 2021 Author Share Posted October 8, 2021 DSS did it in a few mins it was PI that took hours to do it. I used the normal 3. Darks Flats Bias Link to comment Share on other sites More sharing options...
Clive Posted October 8, 2021 Share Posted October 8, 2021 As a first guess I would suspect the flats not doing their job properly. If you have the time perhaps try with and without the flats and/or darks but keep the post stacking processing identical. Their seems to be no evidence of a gradient in the first image you posted. Link to comment Share on other sites More sharing options...
+Graham Posted October 8, 2021 Author Share Posted October 8, 2021 Thanks Clive I will give that a go. The reason there is no gradient on the first one is because I hammered the hell out of it Link to comment Share on other sites More sharing options...
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