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About Aramcheck

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  1. Looks to me like your focus is way off & the scope is out of collimation? Here's the first image stretched... Cheers Ivor
  2. I think it's lens flare, but as I don't have any camera lenses I can't advise on that (so far I've only taken prime focus pictures with the DLSR attached to a 'scope). I've read that it can be reduced by more careful processing, i.e. creating & applying a mask of the flare when stretching... It may be worth trying to take some images without the filter, to check that isn't the problem & also with different lens if you have one. Colours are largely down to the the choices made in processing. You can alter the colour saturation, to help bring out the nebulous regions, but you'd bene
  3. Thanks for sharing the data. I had a very quick go... but I think dealing with the flare on the bright stars will be a challenge! Cheers Ivor
  4. There's a plugin you can try for Photoshop called Gradient Xterminator. It has a free trial:- https://www.rc-astro.com/resources/GradientXTerminator/ I use Pixinsight which has a process called DBE (Dynamic Background Extraction). Other software have similar tools (Siril, APP & Startools). In Gimp or PS you can also create your own gradients & then subtract them... Ultimately it's whatever works best for you. Cheers Ivor
  5. I did, but I'm not sure whether it helped... I also discarded an earlier version which looked too blue to my eyes. Cheers Ivor
  6. Why bother with AP? - For me it's a way to see stuff that I wouldn't otherwise have a chance of finding in our light polluted skies. It's also a challenge to get the best data you can & to learn how to process it. Just finding & verifying this stuff is real is a buzz! I also find it fascinating to plate-solve & annotate the processed image to identify very distant galaxies & then calculate their distance by looking up the redshift/radial velocity on Simbad. Finding a few pixels that represent light from a galaxy that has taken 1-2 billion years to reach the camera is
  7. Thanks folks! I'm not entirely convinced that it's a stray diffraction spike, given the distance but I think I'll have to wait & see... It's nearly a month now since we had any suitable clear skies! I still suspect that it was something to do with the camera orientation, so will have to have a play around if the problem occurs again. BTW I have flocked the OTA, but haven't painted the outer focus tube black yet. @ollypenrice - Thanks - I find trying to get the colours look right is always a bit problematic. I use Pixinsight's 'Photometric Colour Calibration' but still have to adjust t
  8. This was 117 mins in Bortle 6 with a SW 130dps & a Canon 600d (astromodified):- https://stargazerslounge.com/topic/369470-m33-130dps-odd-light-artifact/ It would have been longer but clouds stopped play (again) & at the here at the moment clear skies are few and far between. IMHO Bias / Flats & Darks are a must. (You'll have to check processing with & without darks - I find it's better to use darks). Vertical lines on the 2nd image looks (to me) like bias. If APP does deconvolution then try that to reduce star bloat... It took me a while to get settings right in
  9. Thanks very much for sharing the stacked data! If you use APT to control your camera, have a look at the Framing Mask feature (see:-https://www.astrophotography.app/usersguide/framing_masks.htm#) which is supposed to help framing between different sessions. (I've had no experience with it yet - clear nights here have been few & far between!) Anyway here's my quick process of the data - I couldn't get rid of the line at the bottom left... Cheers Ivor
  10. Thanks @wimvb - I guess that is a possibility, although I would then expect it to have moved over the course of the evening relative to the camera image. As far as I can tell it's in the same place on all the subs & only appears smeared on the stacked image, once the subs have been star aligned. I certainly have problems with low washing lines though & have walked into them in the past! Cheers Ivor
  11. Yes - between each exposure, though it sometimes times out & on this occasion after the meridian flip PHD stopped guiding in Dec. (It was also the first time out with the guide-scope on the 130dps) Cheers Ivor
  12. On 20th Dec we finally had a bit of clear skies. Because it was pretty windy I set up the SW 130dps & set about taking subs of M33. It wasn't the target I had in mind, so during set-up I had the DLSR (Canon 600d astromodified) rotated almost 90 deg to my normal orientation... (and so the Galaxy wasn't framed well). On initial stack of the data, I noticed each of the light frames had a line which looks like some light leakage or reflection, which I haven't seen before. Any ideas what this might be? I had a black shower cap on the primary mirror end of the scope (which blew off half way
  13. In Pixinsight, when you open an XISF the relevant RGGB order is displayed in the Process Console. You should use that order when debayering the images. @geeklee beat me to it answering the STF bit! Cheers Ivor
  14. The APPG also have an Adjournment debate on the proposals penciled in for Monday afternoon in the commons. Cheers Ivor
  15. Best dark skies I've seen (so far) have been about 5 miles north of Dolgellau. It's always depressing coming home... You've gotta love Wales Cheers Ivor
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