alan potts

Well thank Thank-you Carole, this I guess is the only part of my sky where there is a touch of LP, believe me you would kill for sky like mine. It was much better over to the SE area where there is a town Sevlievo about 4 miles away. They changed the lights about 3 years back to these LED type, before this there realy wasn one, even now I can see a 4th mag star in this so called LP, but the targets I have been on lately are over that way. Alan

I wonder if it is worth trying another (7th set) of Flats and Dark Flats? Alan

I know this technique well but it is no good on say the Sole Neb, I have used it many times on Globs and clusters, not tried Galaxies though. Alan

I use PS CC and have no plug-ins. Astro Flat I have been told is good too. I don't really have any LP Carole apart from to the SE with could affect this shot. I see nothing in the image at all until about the 4th stretch. I have even use tools in PS to measure each side and the differences is 1-2 in RGB using PS and this I would have thought was normal but after this 4th or 5th stretch the differences can be 20 and I just struggle to see this is SKY over just over 1.4 degrees from side to side, it is not the Moon that I am sure of. I have just done this stretch and level adjust 4 times, cropped edges out to start, now you see it clearer. The 1-3 stretch saw nothing, it looked flat. Alan

I am assuming PI is Pixs insight, where do you buy this if I wanted it, I see FLO only have Astro Art, looks half decent now you have done that, I feel it could stretch more than I have done. Alan

Thanks all of you I did wonder, some images don't have it but are in different areas of the sky. The problem only seems to be visible after 3-4 stretches, I have even check image both sides with the appropriate tool and can't see anything in the data but after a couple more stretches is comes out, I have manage to hide it a fair bit in most images. I thought iI was doing something wrong, I think after I come out of hospital i will get something like, Astro Flat which Steve uses, and there isn't much wrong with his images. Alan

This is 3 hours of 4 minute subs on M33, you know this. I am getting a darker area to the left hand side most of the time no matter what I shoot. I tend to collect 10-15 subs per night on a target and move on, this is from a few nights and some of the subs will have been taken when the the camera was in or could have been in a slightly different position as I took it off to clean the bunnies out. Is this causing the issue or something else, I have checked the camera is not at an angle and though not perfect stars are pretty round, misshape caused by lower down guiding. I have not spent much time processing so I know it can be better. Is this just a gradient of a different nature, if so I must get some software soon. Alan

Yes excellent image and as said rare to see the whole object. Alan

Stunning image you have taken there, low down for me at little more than 24 degrees but I hope to try this one next year, as I can't be bothered to get up in the night. Alan

I had a 115mm advertised as the same 6-7 years ago but as far as I can recall several changes have been made to new model though I feel this is mainly in the area of the focuser, the objective in the one I had here was good, very good in fact, good value I would say. Alan

I would be happy for you to have a few of my clear nights if you could send some rain, grass is yellow and gave up growing weeks back. Alan

Staggeringly good, only word I could come up with that hadn't been used, so much detail in there, excellent job!! Alan

I use the same YR no, we get fog but it only develops around 4 in the morning, skies here are superb, with a touch of wind and after rain they are as good as I have seen anywhere and I have traveled a lot. I too like you wonder where the fog comes from as we had 43 clear nights and days then a bit of rain for two days and now this 16 night run. Alan

Vlaiv, we have had another 16 clear nights on the trot and 29-32 every day, we will pay for this I'm sure, clear again tonigh and tomorrow. Alan

Now that's very nice indeed Knobby, I want to shoot this but I need to change scopes over, I feel the Borg at 330mm and the 183mc will get it all in. Alan

I thought it was more in line with keeping the weight as far inboard as possible, I tend to use as few as possible though. Alan

I would go for the Duo as it is what I intend to do myself, the Optolong has the better band pass from what I am told as ZWO have now brought their own to the marketplace. There is nothing wrong with using a DSLR, I have done for two years and got some nice results. Some of the other members on here have really turned out some stunning images with DSLR's, making mine look poor. Maybe someone else will advise on a single clip on filter though It is something that didn't try and know little about, I do like the advertising of these duo band filters though. Alan

Now after the star has been fixed I prefer this, that star would drive me mad, as they seem to you as you crop them out, if I go mono with a 1600 I would have to learn that fix. Alan

Two really lovely images there and they look fine together. I asked a while back about mosaics and one member said there were easy in a software the name of which I have forgotten, it was one that many use though, but I don't have. Alan

I prefer the KAF 8300 image as it handle the bright star so much better, both are really good images but for me the bottom one steals the show. Alan

Idle hands have done the devils work yet again, look many thanks for sorting this out for me, I was clueless as to this affecting anything, I must learn to do thing at exactly the same gain etc. So in view of the fact Darks can be done now then I must take another set at 90 Gain and label them as such and stop messing. As the camera is not moved I can keep the others for zero gain subs, I am sure I will take some, grouping is the key. Alan

It was more a half hearted go at it, I can get more subs but with it being low the guiding is far from good, there are a few subs in the post od NGC 7293 that are not round, the time I tend to shoot the sky it always active, even though in that direction I have basically no light until Greece, so LP is not an issue. Maybe add some subs to this and at least try and make it good. Alan

Thanks Adam, does it now, I was wondering what that is, what do you do with it? I don't recall having problems in the first 3-4 images I took, this will be idle hands again I can feel it. Alan

No light leak of this I am 100% sure. Same temperature which was about 23 degrees , does the camera need to be cooled to minus 5 like the lights. Darks were shot cooled to minus 5. I am wondeing if Gain here is the issue, I think the Darks could be at zero gain. Am I correct in believing Gain has to be the same on all shots Light, darks etc etc. All frames are Fits I will try to post as I don't know how to change them apart from after stacking in DSS. Dark D_2019-10-12_10-38-13.fit Flat F_2019-10-19_18-43-38.fit Dark Flat don't take notice of the F at the front F_2019-10-19_18-48-51.fit Light of M33 short last night gain 90 offset 65, I can't recall if the Darks were at this, I think they were. Feel I best not touch anything in future. L_2019-10-19_20-39-35.fit Thanks for the advice. Alan

This is something I didn't have much of an issue with before when using the Canon, just set 400iso and banged away 25 or so shots at 1-2 seconds with a clean pair of Sloggies over the dew shield and light box. Then covering up and shooting Dark Flats the same values. Never had a problem. Now for whatever reason I am seeing fairly large and not nice dust blotches on stacked results. I use APT and normally set about 1 or 2 seconds and cover with either a double layer T shirt or similar, then use my light box. I do not understand what APT's Flats CCD assist is meant to do or how it works. I have now taken 3 sets and the problem still appears there even though I have not moved the camera at all. I have stretched this a bit more from yesterday so people can see what I mean, can anyone give advice to stop this as I am losing faint detail hiding the problem. Thank you in advance, Alan