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Carl M

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    Computer Science, Programming, Gaming, Astrophotography
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    Ramsey, Cambridge, England

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  1. Debayered the RAW's in IRIS and used only the red channel for stacking in DSS. About as far as I could stretch it without noise being too visible. Quattro 8s f/4, EQ6 18 x 600s with a full spectrum Canon 1000D at ISO800 Astronomik 12nm Ha clip filter Might add some RGB to this once the moon is gone, but I do quite like it in mono. Thanks for looking, Carl
  2. With such a bright moon and with it being so close to Rosette nebula I decided to give my much neglected C9.25 a run out. Had trouble trying to get sharp images with it in the past which must have been a cooling problem. Left it outside for a good 2 hours or more before checking collimation and focusing and it seems to have held up quite well. In the past I would leave it outside for a while, do a star test and I would see a heat plume. All images are the best 20% of 2000 frames; captured in Sharpcap, stacked in AS!2, wavelets in Registax and slight sharpening in PS. Captured with ASI120MC and the standard 2x barlow that you get bundled in with Skywatcher telescopes - which I hope to replace sometime soon. Gassendi Copernicus Moretus Rupes Recta Moretus and Clavius area (no barlow) and as a bonus, thought I'd attempt my first mosaic. Didn't expect it to come out well doing it manually but I got something at least. Next time I will use something like EQMosaic and do the whole moon, hopefully it stitches together a bit better. This was 9 frames stitched together in Microsoft ICE. Thanks for looking Carl
  3. Do you have hot and cold pixel detection ticked on the cosmetic tab of DSS stacking settings? I'm sure I've seen that feature do something like this before. If they are ticked I would untick them and restack.
  4. Thanks all, I thought the darker dust seemed a bit red and the stars also seemed overly red which made me think there was a red cast to the whole image. Most images I saw the dust was more of a chocolatey brown colour. @Singlin I think your first post is similar to what I had in mind. I've been playing with levels and colour balance a bit more last night and I think I'm happy with this for now.
  5. I think you've done really well there with an unmodded camera, the long integration time certainly helps it seems. It's going to be my next target so couldn't resist having a quick play in Photoshop, hope you don't mind!
  6. I've never really had a proper go at the Orion nebula, but since it's above the house now at a good time in the evening I thought I'd give it ago. Still can't seem to get the colour balance right with the modded dslr and Astronomik CCD-CLS filter, it still looks a bit too red in my opinion. This was 2 hours worth of 5 minute subs at ISO800. 20 x 15 seconds for the core. Full spectrum 1000D, Quattro 8s on an EQ6. Processed in Photoshop. If anyone has any advice on removing the red cast I'd greatly appreciate it! Thanks for looking, Carl
  7. Didn't have to wait too long for some clear skies to try out one of my Christmas presents - an Astronomik 12nm Ha clip filter. I was also glad for once that the moon was up so I could give the filter a good test. This was my first attempt at a narrowband image so found focusing a little difficult, don't think it's quite spot on. When processing I saw double diffraction spikes which suggests it was out by just a tad. This is 15 x 10min exposures at ISO1600, with just the red channel being used after stacking in super pixel mode. Quattro 8s on EQ6 Full spectrum 1000D Very pleased for a first go, could certainly do with some flat frames which will be done in due course. Any advice or criticism is appreciated. Think I was a bit heavy handed on star reduction, but I do like minute stars in mono images. Cheers, Carl
  8. Very good detail and the star colours are nice and vibrant. Only criticism I can give is the darker regions in the image are a bit green. HVLG and a quick levels adjustment with the black point on the green channel will help a great deal.
  9. Yeah you are right Adam, I try not to pixel peak but collimating this f/4 has turned me OCD about star shapes - that's the only reason I noticed it Quick way to reduce the effect was to run one or two star reductions on the red channel.
  10. I may give Startools a try. I can do it in Photoshop too but the trouble is I want to bring out more dust as well as eliminate noise. Think for that it's best to just get more data, unfortunately had to throw away a load of subs from the end of the night. Cheers! Your Ha images with the 1000D are mightily impressive, convinced me to make a 12nm Ha clip filter my next purchase.
  11. First time taking flats and adding them to an image, they make processing a lot easier when the background is uniform. I don't think they were perfect but they've definitely helped. Will be making sure to take them for every image in the future. 28 x 300s at ISO 800 - 2hr 20mins worth of subs 36 flat frames, no darks or bias Dithered with APT and PHD2 Full spectrum 1000D with Astronomik CLS-CCD clip filter Quattro 8s on EQ6 guided with ST80 and ASI120MC Thinking of revisiting this soon to get some more data and eliminate some noise, but pretty pleased with what's there in 2 hours and 20 mins. Thanks for looking, Carl
  12. Could be internal reflection, but then I'd have thought the bright stars would probably exhibit a bit more of this effect. This is quite a close crop mind, but it's certainly visible in full frame. Other thing to note is that the coma like tail moves throughout the image. Presumably the result of the coma corrector trying to correct it maybe? This is the full frame 5min sub.
  13. I am sure it is the CCD version of the CLS filter, that's what it says on the filter at least. I always focus with the filter already in place since it's the clip in one. I went back and looked at some images I took with my C9.25 which was with the same camera and filter, these also has the same red fringes around stars. This should rule out the coma corrector and the scope being a problem I guess?
  14. So I've been having problems with my stars not being perfectly round, most of that in the past I put down to collimation. However, now I believe that something else is at play. On most stars it seems like there is a chromatic abberation type effect, in particular it seems to be the orange/red stars that appear to show it worse. My camera is a 1000D full spectrum modified (clear glass replacement) and Baader MPCC with the Astronomik CLS CCD clip filter installed, which I thought included IR cut. The red channel seems to be the channel that shows the fringing, blue and green channels the stars are round and not bloated. Here are a set of images from a raw 5min sub to try and show the effect. It almost looks like the fringing has not reached it's focus point, which gives the appearance of the star bloating. Since it is only apparent in the red channel, would that point to IR? In a single image it doesn't look so bad, but after stacking the fringe becomes worse. I'm aware there are some techniques that could reduce it in post processing like this one which I am going to try http://budgetastro.com/micro/articals/red_halos/red_halos.html I would much prefer to combat the issue at it's source though, if I can find out what it is! I'm going to borrow my old unmodified 1000D from my sister to see if the issue still remains. Any suggestions on what it might be? Cheers, Carl
  15. That's some lovely Ha detail from a DSLR. May I ask if you have debayered your DSLR for mono or are you shooting Ha through OSC?
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