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Hi, David, Thanks for going private with your good advice, perhaps you didn't want to embarrass me. But as you will see, no problem, so I'll go public, imho it's too important a subject not to be aired. I use Maxim DL to stack my images, normally using median combination. But with this particular image being taken in the short period of Astronomical Twilight, I didn't really have enough subs for that to do a complete job. Sigma clip was marginally better, but the brightest trails still left a faint remnant which I had to work on in Photoshop. I would have been better with twice as many 5 minute subs instead of the small number of 10 minute ones. For example the attached image is a single calibrated green sub frame (reduced to 1/3 size). Just a couple of trails, but one of them exceedingly bright, so as there were only 4 green subs, the resultant RGB colour combine contained a faint green streak which had to be further worked on. It would appear that those who are now using CMOS sensors generally have many more but shorter subs than we CCD dinosaurs are used to working with, so the rejection algorithms have a much better chance of doing a good job. But of course those large amounts of data need very powerful up to date computers with a lot of memory to process the data. My desktop is quite well specified, Windows 7 64 bit, i7 processor, but with 'only' 6 GB RAM not all that well equipped for handling massive amounts of data, although since I recently fitted an SSD has improved quite a bit, and it zips along with my relatively modest requirements. The maximum RAM the computer can take is 8 GB, so very little room for improvement there. I have to say the general feeling I'm getting both from this forum and Stargazers Lounge is that 'we're all right Jack', we can beat the satellite trails with clever processing. But that's not really the point is it? As Olly Penrice states in my SGL thread 'The satellite situation is like the plastic situation. We are drowning in plastic, yet still we churn it out.' Here is the thread for those interested in having a look: https://stargazerslounge.com/topic/409788-horror-story-satellite-scandal/ It's bad enough for us amateurs at home, and must be particularly annoying for those lucky enough to have their own remote observatories at dark sites, with the attendant costs and initial hard work setting it all up. How much worse must it be for the large professional observatories with their huge multimillion pound telescopes! Cheers, Peter http://www.madpc.co.uk/~peterv Approx. 55 deg N, 2 deg W (Northumberland, UK)

Hi, guys, I don't often post on our forum, but thought you might find this interesting, unless of course you've seen my thread on Stargazers Lounge. In 2020 I imaged the nice grouping of Messier 53 and NGC 5053 using my QSI683 and TMB105 (650 mm fl). Last Summer I bought a SharpStar 140 refractor to replace my Meade 127 - pure self indulgence! And very nice it is too. With the poor season I've been having this year, I wanted to try something in Astronomical twilight, and found the two clusters would still nicely fit in the field of view. So went for it on the evening of 15 May. Unbinned so 10 minute subs to get reasonably deep. And in the end it came out quite well. Luminance 8 x 10 mins, RGB each 4 x 10 mins. BUT it needed a huge amount of work to get a decent looking image because when I counted them up in the individual sub frames there was a total of 54 satellite trails in 20 subs, the worst individual sub containing 7 trails! So I've also attached a summed image of all the subs, showing most of the trails although some of the fainter ones are lost. I should point out that my 2020 subs only contained 2 trails in all. An awful lot of new stuff up there :-( I hope Mr Musk's ears are burning! Cheers, Peter. -- http://www.madpc.co.uk/~peterv Approx. 55 deg N, 2 deg W (Northumberland, UK)

Hello All, has anyone had success in using the QSI drivers from either the QSI or ATIK web sites on Windows 11? In all my trials, 2020.07.30 drivers return the error message included below, and older 1.0.0.3 drivers don't even register correctly and don't come up in camera Chooser menu. My workaround has been to downgrade to the 7.4.1824 versions, which work. For what it's worth, all of these versions work fine on Win10. Sorry in advance if this is a trivial question, but all of my searches on the topic came up empty. Thanks, Roman.

Dear All, does anybody of you have the specs for the jack connector that provides power to the CCD camera? I might be using the wrong one as sometimes I don't get contact. Thanks a lot! Nicola -- Nicola Sky Monsters - http://www.skymonsters.net Skype: betelgeuse368 Privo di virus.www.avast.com

My first complete project with my 6162. Pretty happy with this result even though I have some gradient issues I mentioned in a previous post. 12hrs total over 3 nights.

My first light with this camera and I have a gradient that appears in my LRGB masters (36x300sec light frames). This was taken with a 10" RCX 2400mm FL. This is a stretched master flat: The noticeable dust donut on the lower left seems to be for the most part removed accept for when over stretched. I circled the donut in this image: I used an ADU count of 32000 for my flats. I'm leaning towards an internal reflection causing this issue. I made a test image with an HA filter and I don't have this issue. I can remove the gradient when processing: Does this look like a flats issue? Looking for some words of wisdom. Pete

QSI 683 WSG8 - $2K for the whole shebang! Includes: Power Supply USB Cable Guider Cable 2" Nose Piece Astrodon Tru-Balance LRGB E-Series CCD Filters Astrodon Tru-Balance SHO 5nm CCD Filters $6350 - If purchased new. Free Shipping USA.