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About Roy@Aldermaston

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    Berkshire, UK

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  1. I've just put together a polar scope webcam using a Logitech C160 as the Phillips SPC900NC is no longer available at a sensible price. Last night I tried it out for the first time and was disappointed to discover that although the reticule markings were clearly focused, there was no sign of Polaris. I played with the various settings in SharpCap, but couldn't find Polaris, which was bright and clearly visible by eye through the polar scope. I didn't have the SW Synscan handset connected and the reticule was quite brightly illuminated, which may have been part of the problem, but the clouds ro
  2. Peter, Once you have the connect equipment panel open in PHD2, select the small button, with a crossed screwdriver and spanner icon, next to the camera name. That will open a dialogue which allows access to the gain slider . I have mine set to 98%, which at my location works well with 2 sec looping. Roy
  3. Thanks Steve, The spacing was set up by Bern at Modern Astronomy and checks out OK, and apart from cropping to remove the over-scan the image hasn't been processed. I never had that banding before, but its appearance does correspond with with the adjustment of gain and offset to higher values. Once the weather clears I'll experiment with the new settings before tackling the curvature issue. Roy
  4. Thanks Simon, I've had another go and worked through the sets given in the manual. The values that I've come up with are Gain = 3 and Offset = 120, and that seems to agree with those that others are using. Now all I need is a clear sky and no wind. Roy
  5. Thanks Steve, I'm relieved that it's probably me and not the camera. When setting the gain and offset should I have my LP filter and MPCC fitted as usual, and does the camera need to be fitted to the scope, or just free standing. Roy
  6. Thanks for the replies. I've attached a zipped stack of 11 600 sec lights taken with gain at 15 and offset at 125. There is a strange circular banding effect around the image centre when its stretched, perhaps caused by having the gain set too high, its certainly produced spectacular vignetting. Roy NGC7142.zip
  7. I would welcome advice from anyone who has experience of the QHY8 Pro camera. I bought it as a step up from my modded Canon 1100D, but aside from the advantage of step-point cooling it's proving to be an expensive disappointment. Compared to the Canon, the images lack contrast and overall it seems far less sensitive. I've spent hours of wasted imaging time trying to get the right balance between gain and offset, using both the manufacturer's instructions and the many contradictory methods posted online. None seem to produce any significant improvement. I'm beginning to despair of ever getting
  8. I've mostly used artificial flats with the subs from my 1100D, but its about time that I got to grips with the real thing. So far my efforts have worked well at removing dust bunnies, but have been less successful with vignetting. The problems is this: by lights show the usual pattern of vignetting, being bright at the centre of the frame and fading in a circular fashion towards the edges. Not so with the flats: the centre of the vignetting is displace towards the bottom of the frame, such that when stacked the final image shows a horizontal gradient along the top of the picture. I've tried th
  9. I've used it for a trial period and it does work, although it sometimes produces odd colour casts. However, I found it to be less affective than Fitswork, a freeware program with other useful flatten and noise reduction functions. If you want to try Fitswork 4 here's the link: www.fitswork.de/software/softw_en.php
  10. Poor seeing of late with very misty conditions, hence this is a rather noisy image. 15 X 420 sec lights @ ISO 800 and 5 darks. Taken with a self modified 1100D Thanks for looking, Roy
  11. Congratulations Paul, I agree with the above, lots of detail there. Roy
  12. David is the attached image the feature you're talking about? If it is then as far as I know it simply provides controls for slewing the scope, and has no bearing on the guide rate. I use it occasionally if the scope needs nudging to clear excessive backlash, but otherwise it plays no part in the calibration or guiding. I believe there is an option for disabling it, but I can't quite remember where it appears. Roy
  13. After a great deal of thought and hesitation, I've finally removed the IR cut filter on my 1100D. It's a fairly straightforward job and would have taken no time at all, except for the excessively tight screws holding the case together. I managed to strip the cross heads on three, but was able to drill out the heads and once the camera case was open it was easy enough to remove the threaded shanks. Luckily I've been holding on to an old Canon film camera, which I was able to cannibalise for replacement screws. Despite a few expletives and tense moments it was worth it and I'm pleased with
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