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The Jackal

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  1. You now confusing me a whole lot. So you saying both my images are fine as the ISO 1600 image is around 1/3 from the left and the ISO800 image around 1/6th
  2. Would someone please suggest a method to fix this ? My Canon Camera when mounted onto my GSO 8" Crayford 2" Focuser seems to have a slight play on it. Now I am afraid this might impact my lights/dark's and bias frames when rotating the scope and the camera moves from its original position. I couldn't shot the effect on a photo so I uploaded a short video of it on youtube.
  3. I shoot with a Canon 700D and after stacking my images in Pixinsight I got this results (see photo). The glow doesn't show up on any of my images but yet it is there on the image. The final image took loads of cleaning up to remove the glow which was little visible no matter what.
  4. Thanks Pompey. I still think I should have shot my frames in ISO 1600 instead of ISO800 as the ISO1600 histogram shows the scaling closer to 1/3 on the image.
  5. Thank you Mike it explains it much better for me. Here is to two different ISO's with Histogram. Is it normal for the Blue to be spread so far wide on the ISO 1600 image? And also am I correct in saying the ISO 1600 image might have been the better image for the night is the histogram shows it around 3/1 or 4/1 from the left. The ISO 800 photo was little underexposed perhaps?
  6. Just on another topic regarding the tracking. I have an Advanced VX mount and on this night my tracking was quite good I think. I would have been able to take much longer exposure but thought ISO800 should be the minimum. Next time I will try ISO 400 and instead of 90seconds I will try and expose 240seconds or more. Here is the tracking results on PHD
  7. Sorry for not labeling the pictures but they go like this. The 1st image (bright green one) is when I stacked the images in Pixinsight. The 2nd image with little red in the Galaxy is the final image after Processing in Pixinsight. The 3rd image (darker one of the bottom or last two) is ISO 800. The 4th image (brightest one) is ISO 1600 @Dave I do have a LPF in my camera. @Mike or Pompey. Would you mind explaining the bit about the histogram? I dont know how to check this really with my DSLR or where it should be after one image. @Pompey. SCNR is always part of my process in Pixinsight. The very green image just looked funny. As you can see in my final image it was removed.
  8. Hi Guys. I would just like some advice on which ISO setting to use. I shot these photos in heavy light polluted sky's and at the time this photo was shot 3 days ago it was 4 days from full moon, 60% humidity and 23deg at night. The moon was behind a building so it did give me some visibility. I exposed both images 90seconds long as I felt longer exposure would be to bright so instead I tried to different ISO settings. The lighter image was shot in ISO1600 and the darker one ISO800. My question is with all the elements against me which would have been a better choice for stacking? My final question is when stacking the image in Pixinsight it came out very green. I didn't shoot any FLAT FRAMES but did have darks and bias frames. Is this green normal or did I do something wrong? Image details in Pixinsight: 21 Light frames ISO800 (90seconds), 15 Dark Frames (90seconds), 50 Bias Frames (Fastest Camera Speed). I have also loaded my Final image after calibration.
  9. Here is the image I manage to shoot last night. http://www.astrobin.com/228589/0/?
  10. So this is just an update with a question. I did an alignment last night and when I went to the opposite side of the meridian it somehow lost my calibration starts. Anyway, I think the alignment was good. Peter please let me know if this PHD graph is satisfactory. Can you also let me know if they say the opposite side of the meridian do they mean if I am on a star on the south close to the meridian, do I have to go to a star in the north close to the meridian or one just on the other side of the southern one but on the opposite side of the meridian?
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