Popular Post DaveS Posted May 11, 2021 Popular Post Share Posted May 11, 2021 After fighting this for a couple of weeks now I think I've finally beaten it into submission This is 15 Red, 15 Green, 27 Blue and 31 Luminance in 10 min subs with the ODK rig Stacking in DSS with full calibration (And using correctly exposed flats) the post in AstroArt 7 (Which was leaving rubbish behind). Initial Histo Stretch then DDP, Gradient Removal and another Histo stretch. The Luminance was additionally given a masked Unsharp Mask on the galaxies. Cropped after LRGB and some fiddling with colour balance. Still nothing like perfect but will have to do until next year when I hope to get proper G2v calibration instead of the bodge-up here. 11 Quote Link to comment Share on other sites More sharing options...
Dmack1 Posted May 11, 2021 Share Posted May 11, 2021 Nice image - not an easy target i think. 1 Quote Link to comment Share on other sites More sharing options...
Sarum Posted May 11, 2021 Share Posted May 11, 2021 Well that looks pretty impressive to me. I've been struggling with the same galaxy group, and I have to say my efforts with an OSC cmos camera are poor by comparison. Although imaging from a Bortle 4/5 location, I'm plague by high humidity levels which makes these faint objects so hard to capture. Roy 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 Yeah, those tidal tails are *very* faint, barely above the noise floor. I'm in a Bortle 3/4 location, but only a mile from the sea so humidity can be stupidly high. Quote Link to comment Share on other sites More sharing options...
peter shah Posted May 11, 2021 Share Posted May 11, 2021 Thats pretty deep Dave....superb job 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 Thanks Peter, yes it's been a bit of a fight to get it this far. Maybe more and *better* data next year. 1 Quote Link to comment Share on other sites More sharing options...
Jkulin Posted May 11, 2021 Share Posted May 11, 2021 Yep Dave, that is really good, I know when I did it, it was a pain in the ass and I had nearly 20 hours in it albeit it in Bortle 5/6 skies 1 Quote Link to comment Share on other sites More sharing options...
peter shah Posted May 11, 2021 Share Posted May 11, 2021 33 minutes ago, DaveS said: Thanks Peter, yes it's been a bit of a fight to get it this far. Maybe more and *better* data next year. Its no fun if you don't have a fight on your hands 😀 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 Thanks John, yep, not the easiest of targets! 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 Indeed Peter. It didn't help matters that my initial set of flats were badly underexposed, due to not taking enough care over the decimal point in the histogram display, Dur... 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 For anyone looking, those five galaxies just to the left of NGC 3718 are Hickson 56 at 435 MLY away! Quote Link to comment Share on other sites More sharing options...
geoflewis Posted May 11, 2021 Share Posted May 11, 2021 You may think that it's not perfect David, but it is a cracking, deep image and worth all the trials and tribulations you had getting there. Really well done. 1 Quote Link to comment Share on other sites More sharing options...
rwillits Posted May 11, 2021 Share Posted May 11, 2021 Very nice, I like the colour. On my screen. it has a silver sheen. 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 11, 2021 Author Share Posted May 11, 2021 8 minutes ago, geoflewis said: You may think that it's not perfect David, but it is a cracking, deep image and worth all the trials and tribulations you had getting there. Really well done. Thanks Geof. I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes. 1 Quote Link to comment Share on other sites More sharing options...
geoflewis Posted May 11, 2021 Share Posted May 11, 2021 5 minutes ago, DaveS said: Thanks Geof. I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes. Yeah, such comparisons will always leave one disappointed. I'd be pretty stoked to have that one in my collection. 1 Quote Link to comment Share on other sites More sharing options...
Jkulin Posted May 11, 2021 Share Posted May 11, 2021 8 minutes ago, DaveS said: Thanks Geof. I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes. I had exactly the same issue Dave, I wanted more blue and to get the tails in and I tried so hard because I had seen it present from darker sites and eventually relented that from Wolverhampton you ain't going to be able to get that deep. 2 Quote Link to comment Share on other sites More sharing options...
Bob-c Posted May 11, 2021 Share Posted May 11, 2021 That is a great effort Dave on this target,better than mine. I didn't get the tidal tails showing. I imaged it 12 months back ,this has given me inspiration to have another crack at it again when the opportunity arises. Bob. 1 Quote Link to comment Share on other sites More sharing options...
Carastro Posted May 14, 2021 Share Posted May 14, 2021 Looking great Dave, glad you finally beat it into submission. Carole 1 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted May 14, 2021 Share Posted May 14, 2021 Great work Dave, some lovely fine detail coming through. 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted May 14, 2021 Author Share Posted May 14, 2021 After @geoflewis pointed out some misalignment is the stars i had another go using the Coregister function in AstroArt rather than the simpler Alignment. This corrected for a slight lateral chromatic aberration. I also applied a bit of unsharp mask and denoise, with masks to hold the detail in the galaxies and avoid unsharp mask from messing up the background. This might be as far as I can push this data set. This is a JPEG, the PNG is 68 MB, and the FITS more like 168 MB. 2 Quote Link to comment Share on other sites More sharing options...
Gina Posted June 19, 2021 Share Posted June 19, 2021 Nice one Dave! Very nice 👍👍👍 1 Quote Link to comment Share on other sites More sharing options...
DaveS Posted June 19, 2021 Author Share Posted June 19, 2021 Thanks Gina. Quote Link to comment Share on other sites More sharing options...
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