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michael.h.f.wilkinson last won the day on August 28

michael.h.f.wilkinson had the most liked content!

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About michael.h.f.wilkinson

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    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
  • Location
    Groningen, The Netherlands
  1. Having two counterweights instead of one heavier one also makes the mount more versatile. I use just one counterweight on my Vixen Great Polaris when using the APM 80mm F/6, but two with the C8 and planetary camera set-up, and even three if I add the big finder scope for visual DSO hunting.
  2. Here it is: It is not a very expensive item; I got it for €199
  3. Just to add a shot with the focuser extended (not fully) I also like the thread that allows more stable attachment of imaging gear.
  4. It is an improved Crayford, with steel bearing surfaces (like a Baader Steeltrack). All R&P refractor focusers I could find were too long.
  5. I just received a new focuser for my APM 80 mm triplet, to replace the standard Crayford. The Crayford was OK, but a bit too long to let my cameras come to focus with the 0.6x focal reducer. The new one can handle a much larger load (5 kg), and is 25 mm shorter. It really feels better made than the old one. It also allows easy attachment of a motor focus unit. My filter-switch diagonal should now also reach focus with the new set-up. I will now see if I can adapt the old one to the ST80. As expected, clouds, wind, and rain accompany the arrival of the focuser.
  6. Nice set of images. I did spot the moon yesterday, between heavy rain squalls, but it was hiding behind the trees from my garden
  7. These sound really interesting. Especially the fact that they are not stopped down makes them a great alternative for the old BA-1 crowd
  8. I have switched to ZWO filter wheels, and I am having difficulty getting this to work on a Windows 8 laptop. The filter wheel comes in original box, and is complete with all cables, but no nosepiece (I always connected it directly to the T2 thread of my flip mirror). No filters are included. I am asking just £50, plus postage, due to the lack of nosepiece, and the fact that this is an elderly item that will require some tweaking of the software set-up to get it to work.
  9. As I now have electronic filter wheels, I am selling my manual wheel. It is in good working order, with only a few superficial scratches on the outside. No filters included. Asking for £50 plus postage. Open to sensible offers.
  10. OK, this just doesn't seem to reach infinity focus with the DSLR . I have just found a replacement focuser which is 20 mm shorter, and can handle double the payload. It is even priced €36 off, so ordering it was inevitable, I suppose, especially when you have just sold an item of your kit which covers the cost. Resisting temptation? I've heard of it. Doesn't seem to happen much around here, these days
  11. Snapped up a 0.6x focal reducer from ABS-UK. It has just arrived with just a few marks on the tube (as advertised) but optically perfect. This will transform my APM 80 mm F/6 triplet into an F/3.6. It should still cover the chip of my Canon EOS 550D, but allow faster, wider-field imaging. I also want to use it with the ASI183MC for deep sky. It might not be cooled, but should beat my previous combo of Canon EOS 550D, APM 80 mm F/6 with 0.8x focal reducer (so F/4.8, effectively). Unusually, the forecast for Sunday night is clear. Fingers crossed.
  12. Single shot with my Canon EOS 80D and 100-400 mm F/4.5-5.6 L IS zoom, at F/5.6, 1/160s ISO 800. RAW file converted to TIFF and contrast stretched a bit in PIPP, converted to JPG in GIMP, no further processing. I took more shots in RAW but somehow stacking isn't working yet.
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