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Peter Drew

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Everything posted by Peter Drew

  1. I think I would call this a sleeve nut. It would be intended to adjust end float on the worm shaft, not backlash. 🙂
  2. Perfectly reasonable to have the markings pointing outwards as that is the direction they face. However, the convention is usually to have the arrows facing each other as the apex of both then also determines the radial location. 🙂
  3. I'm fortunate that each of my main contenders has its own housing at a decent site so no need to worry about cool down, set up time or weight and no real plans to take them elsewhere. The choice is between a 30" Dob, 20" Dob, 50x300 binoscope, 8.5" refractor and a 6" Ha solar telescope. The winner, hands down is the 6" Ha solar telescope. I'm no longer medically suited to cold, late outdoor pursuits and solar observation is potentially available everyday, the Sun is the most dynamic object you can easily observe and is different every day, hour or even minute. The telescope can easily be reconfigured to night time use if really necessary. 🙂
  4. Quite often, real bargains can be resold at a profit. 🙂
  5. It's John Nichol's time used to make the mirrors, it's your time used to make the telescope. John also gets paid for his time. 🙂
  6. Genuinely lost count, but I definitely know it is one less since last weekend as I donated one to a visiting cub group rather than spend the time trying to repair the very broken and poor quality one they brought in for an MOT. 🙂
  7. The Andromeda Galaxy is a large object, as the telescope is increased in aperture it no longer fits into the field of view. Using my 30" Dob it looks more impressive in the 80mm finder as there is a fair bit of dark sky surrounding the galaxy. 🙂
  8. I can see the problem now, when the author contacted AI for the design he/she also left the "e" off the end of heroine, this confused AI. 🙂
  9. All viewers will recognise it as being a telescope, that would have been the criterion. I guess that AI has not yet used a telescope. 🙂
  10. What gap?, I don't see one between what you already have and your proposed C11. The 80mm refractor should cover most of what you might need to do visually for very wide field visual and AP DSO, the 127Mak should be fine for physically manageable visual double stars and solar system objects and the C11 for more advanced AP. There is a numerical gap but not one of performance. The C11 would trounce anything affordable in the numerical gap on visual DSO's. 🙂
  11. On the principle that the best telescope is the one you use most, my situation is that the SWED150 is piggy backed on a 16" SCT, itself on a massive mount and in an observatory. To use it just requires opening the dome and switching on the power. By contrast, the Vixen has to be moved from a cupboard, the mount and tripod have to be carried outside and set up. The Vixen tends to stay in the cupboard and I don't think I've used it for at least 3 years, a 4" Tak would have a similar life for the same reason. 🙂
  12. I have a Vixen 102mm Fluorite, widely considered as being on a par with a 100mm Takahashi and a SW150ED. Despite both giving top class refractor quality images, for me the 150 is superior. The 102mm runs out of light at the magnifications that I need for my ageing eyesight. If portability or a suitable mount is not an issue then IMO the 150ED would be a better buy. I paid ÂŖ1000 for my 6 month old one! 🙂
  13. I'm no expert but I do know that original Vixen handsets were centre negative. Maybe things have changed since but they were only protected to 1 amp so great care must be taken. A friend used to have a handy little pocket money side line in repairing and adding better protection to Vixen handsets. I have used cigarette cables on centre positive equipment with no problems. 🙂
  14. I agree with John, it looks nothing like my Vixen 102M.
  15. That should do fine Paul. Compare that with the size of the obstruction on small Mak's and SCT's and you will see that there is little to worry about regarding performance. 🙂
  16. Sorry to read this Paul ☚ī¸. Despite the damage, if the areas are blacked out there will be little affect on the performance, a resale would take a big hit unfortunately. I had a 90mm Vixen with a much larger chip and it still worked fine.
  17. There is an alternative screw in adapter that accepts 1.25" eyepieces. 🙂
  18. The one and only time that I've seen it was with my 30" Newtonian back in 1986. It was in twilight so Sirius was dimmed but not too light to lose the Pup. The Pup must be getting either a wider separation or getting brighter as telescopes down to a 4" seem to make it available under good conditions. How long before someone spots it naked eye? 🙂
  19. I always specify Royal Mail delivery, apart from not recalling any problems in the past, should I miss a delivery the post office is just a short walk away. I did recently miss a hospital appointment due to a late letter delivery. 🙂
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