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michael.h.f.wilkinson

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michael.h.f.wilkinson last won the day on October 14 2020

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About michael.h.f.wilkinson

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    http://www.cs.rug.nl/~michael

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    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
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    Groningen, The Netherlands

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  1. Collimation of an SCT is rarely needed if ever. I took a shot o Jupiter and moons in about 2015, and it showed albedo spots on Ganymede, twenty years and many travels after I bought it, and I had never touched collimation in all that time. I checked it every session, but always found it to be fine.
  2. Impressive list. Mine is quite a bit shorter over the last 42 years: 1979: Home-made 6" F/8 Newtonian (Real planet killer) 1993: Rebuild of the 6" F/8 (new octagonal wooden tube, better flocking, baffles added, better focuser) - sold in 1995 to finance GP-C8 1995: GP-C8 -still with me 2011: APM 80 mm F/6 triplet - still with me 2013: LS35THa donated to outreach programme of Kapteyn Astronomical Institute in 2015 2014: ST-80 guide scope bought - still with me 2015: Coronado SolarMax-II 60 mm - still with in my office, for the odd H-alpha session at work 2
  3. Thanks! It got me my first prize in the SGL eclipse imaging challenge
  4. It is real, although pseudo colour and some sharpening of solar detail by stacking segments of the same 1000 frame sequence without interfering birds has been done. The movie is here
  5. I have Nagler, XW, ES 92 deg, Delos, and LVW EPs and none fell down in fast scopes (at least down to F/4.1). Only the MaxVision 24 mm 68 deg fell down at that F ratio, but it is fine at F/6, and is claimed to work well at F/5. Only a first class ortho could perhaps better the views in a Pentax XW, but at the expense of FOV and eye viewing comfort. My widest EP is the ES 12mm 92 and it is superb. I used to have two orthos: a 25 mm Ioved, and a 5 mm I hated. A key problem with the classic Abbe ortho is that it is a scaled design, and that therefore the eye relief is a fixed fraction of the focal
  6. Here are the constituent monochrome images H-alpha O-III S-II The H-alpha really blows the others out of the water
  7. 10x50 is a nice size, and Nikon is a good brand, so you won't go wrong, as long as you steer clear of zoom versions. I generally use my 16x80 Helios Lightquest without monopod for quick session, although I realize most find this a handful. An excellent source on choosing binoculars can be found here: https://binocularsky.com/binoc_choosing.php
  8. Yesterday was very clear indeed, and I made the most of it by grabbing a lot of narrowband data, primarily S-II, which had been cut short by clouds to just 18 minutes previously. I grabbed 2 hours 12 minutes of S-II, and another hour of H-alpha and O-III each, bringing up the totals to 2.5 hours, 2 hours and 2 hours for the three bands respectively. Although the S-II band now does show some nebulosity, it is still completely overwhelmed by H-alpha, so SHO doesn't work that well Trying to stretch S-II introduces way too much noise, so I will have to get more S-II data (Thursday, mayb
  9. My min worry is that it might be geared towards spotting scopes and terrestrial viewing, so it might have issues with angular magnification distortion. Still a very interesting zoom EP
  10. Got the camera set up early, started imaging at 19:30, have already captured 2 hours of S-II, now grabbing an hour of O-III, ending with an hour of H-alpha. Will add these data to those of February 27. The set up S-II (very faint) O-III H-alpha
  11. Had a brief lunchtime session with the SolarMax-II 60 again. Only a small prom right down south visible now, and a small filament near the southernmost edge of the disc. Two small ARs could be seen, the larger south and east of the centre, the other closer to the edge in a more north-easterly direction. Quite bright patches of plage and some dark filamentous detail could be seen in both. Otherwise the sun is pretty quiet
  12. If you are going to observe, rather than image, the alt-az mount is to be preferred over a (shaky) EQ-2 mount. Personally I would much prefer a table-top Dobson, like the Heritage 130P: https://www.teleskop-express.de/shop/product_info.php/language/en/info/p2705_Skywatcher-Heritage-130P-FlexTube-Dobson---130-mm-Parabol-Optik---ab-6-J.html You get far more aperture, twice the light-gathering capacity, in a cheap, but decent mount. The slightly larger Heritage 150P is just over the maximum you list: https://www.teleskop-express.de/shop/product_info.php/language/en/info/p1227
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