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Andymod

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Everything posted by Andymod

  1. A good friend at Sheffield Astronomical Society, took my stack that I used above and processed it in Pixinsight. Wow what a difference. I have a lot to learn.
  2. Hi Russell, I didn’t get to the bottom of the rings to be honest, I did wonder if it was condensation on the glass in front of the sensor. When there’s a heavy dew I wrap a small heater band around the spacers between the camera and Flattener.
  3. Thanks to everybody who commented, I had more or less given up with the QHY8L. I spent so many of my limited imaging nights getting no images it destroyed my confidence and almost made me give up altogether. I defaulted to using 600D to rebuild confidence. After everyone's help and calculating the gain and offset for the camera, I just needed a night to grab some data. I hope to practice more at processing and maybe tone down the Ha a bit. My excitement at finally grabbing an image may be the reason the Ha was extreme. Thanks everyone.
  4. I think I am finally making small amounts of progress with the QHY8L. This image is 7x600s stacked. I used darks, flats and bias. Still trying to get to grips with processing but finally seem to be making progress. North American Nebula from a light polluted Sheffield.
  5. So I finally found some spare time to have a go at setting up the gain and offset of my QHY8L following the guide above. Everything appeared to be going well until the final step "Complete a photon response plot of CCD". With the camera capped and an exposure of 0.001secs my mean pixel value is 637 which is above 400 so uncapped the camera and began exposures with 0.025secs, my mean pixel value was 64996. increasing exposure to 0.050 secs and the mean value hits max 65535. I calculated my gain to be 11 and offset 108. The guide suggests the mean pixel value should gradually rise?. Whats going on?.
  6. Thanks Steve I will have a read now I have a working laptop charger
  7. I will go 600 secs next time out and get a full suite of calibration frames, although now my laptop charger has decided to give up charging, it will have to wait until I get another charger. Just my luck at the moment.
  8. 300 secs and only 4 in stack. As soon as I can I am going to setup my camera gain etc again and capture a decent amount of subs and a full suite of calibration frames. My interest in the QHY8L has been resurrected. A Massive thanks for everyones input.
  9. Hi Thankyou for all your help, I set the cooling at -20C. The fact that you managed to get anything is a great help. I can try and achieve an image knowing there is data there. Should I be worried about the level of noise?.
  10. OH MY GOD!!!! Thankyou for your help, I cannot believe that is my data. Correct me if I am wrong, my spacing is reasonable? and if I take Darks and Flats I should see a marked improvement?.
  11. Link for autosave file from DSS. No calibration frames were used unfortunately, But to be honest any image would be a huge leap forward for me. Thankyou for your help. Autosave.tif
  12. Really, That's interesting on my laptop I see a very green image with rings of varying brightness. I have learnt more in this post than I have in the last year. I have a friend at my local astro society who tried to process the last light frames of M45 I took with the QHY8L. He failed to produce anything and suggested my camera may be faulty.
  13. Hopefully this Tif image may illustrate the issue better. rosette qhy8L.tif
  14. Really, that's encouraging. Its difficult for me at the moment because I am not sure if its my limited processing skills or an error with setup/camera operation or both which is letting me down.
  15. The images posted are Jpeg saved from Photoshop. When I look at the Tiff image I have what I can only describe as circles of varying brightness from the centre of the image working outwards.
  16. I have just noticed when uploading the images that the Varying brightness is not as obvious now?.
  17. Hello, I have not posted very often but visit the site a lot. I have owned a QHY8L CCD for just over a year and used it very rarely. After initially using it and completely failing to produce any images, I gave up and returned to my modified Eos 600D. Over Christmas I have began reading 2 books by Steve Richards, "Making every Photon Count" and "Dark Art or Magic Bullet". Revisiting some of my Eos data I am making a small amount of progress improving the processing. I really want to master using the QHY8L and have looked at some of the previous data I have gathered. Previously I had no discernible image and now the image I have is awful but there is something there which is a step forward for me. The main thing I have noticed is the "Rings" of varying brightness. My question is could this be caused by the spacing of my QHY8L to my Reducer/Flattener. All feedback is genuinely appreciated I would love to produce an image from my QHY8L this year. Thanks Andy
  18. Seems to be selling a few things that were up for sale on this forum, at inflated prices. Certainly will not be purchasing. Just trying to make a quick profit, buying up stuff from classifieds.
  19. Excellent service and the extra piece of mind is very assuring. I would happily pay for a quality repair.
  20. Not sure if this helps but it's a picture of my motor control and power board
  21. Just had a measure around the dew shield and its approx 33cm.
  22. Whilst observing last I noticed dew appearing on the lens of my GT81. My question is where is it best to place a dew heater band on a refractor, around the dew shield in the area of the lens or at the base of the dew shield?. The diameter of the dew shield is greater than the main tube, so if fitted around the shield what size band do I need?. Thanks Andy
  23. That's definitely an improvement, the colour seems more natural now, thanks for that. All information is gratefully received. And of course it was as you said upside down.
  24. Thanks I will try and have a go later, do I need any particular software package?
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