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BinocularSky

Advanced Members
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About BinocularSky

  • Rank
    Brown Dwarf
  • Birthday 23/04/50

Contact Methods

  • Website URL
    http://http:/binocularsky.com

Profile Information

  • Gender
    Male
  • Interests
    Visual astronomy (obviously), Kites, AmDram.
  • Location
    Between the New Forest and Cranborne Chase

Recent Profile Visitors

3,226 profile views
  1. 'Scuse me butting in: Shouldn't be too difficult: You could make a rat cage with a couple of brake discs (NBD005 fits the HEQ5, I think, but check: 60mm cental hole), 3 lengths of M16 studding (+ nuts & washers) and a couple of plates of 6mm steel, one drilled to fit the pier bolt, the other to M10 (I think) for the securing bolt for the HEQ5.
  2. Don't get me started on PIN numbers and HIV viruses!
  3. What you need is a StarChair:
  4. OK, thanks. Appreciated. (Was hoping to keep the parked scope well below fence-height for security reasons)
  5. Thanks, @DaveS - (apologies in advance for dogged nagging!) if you wanted, would you be able to cover it if it was parked with CWs down and scope pointing W or E?
  6. Thanks for this, @James. As usual with me and this sort of thing, it has helped to trigger more questions. When you say "take off the counterweights", do you mean just the counterweights or the shaft as well? I have since done a bit more research on this and am now considering the idea of leaving the scope (4" apo) on the mount and getting the refractor cover: * Does its design pose any restrictions on the angle at which I park the telescope (&, if so, what - could I, for example, park the scope horizontally, perpendicular to the weight shaft, or must they be in the same or similar vertical plane)? * I realise the images on the web page are for "illustrative purposes", but they seemed to have "skirts" designed to accommodate tripods; are they suitable for piers?
  7. @oobydooby - gone to Faulksy.
  8. Please could someone who knows the range advise on which 365 cover would be best for a pier-mounted Vixen GPD2 (approx SW EQ5/HEQ5 size). TIA
  9. Ermmm - not quite. The distinction has nothing to do with transparency, but with refractive index. In fact, BK7 is more transparent than some Chinese BAK-4, which is not the same as Schott BaK4 (and it's not just the capitalisation of the 'a' and the addition of a hyphen!); it is actually a phosphate crown (BaK signifies barium crown) and has a higher permitted inclusion count. Also, BaK4 (and BAK-4) has a higher dispersion than BK7. If BK7 glass was as poor as some people try to make out, do you really think it would be used in the best binoviewers? In binoculars, the use of BaK-4 eliminates the grey segments you see at the periphery of the exit pupil which, in the image you get equates to vignetting at the edge of the field of view. Quite frankly, if someone who is hand-holding binoculars can't figure out how to shift the target from the vignetted edge to the bright centre, they should probably be considering switching to another hobby.
  10. Faulksy is deciding whether or not he wants it; if he declines, you're next in line.
  11. Oberwerk Ultra is one of the brands under which the United Optics BA8 appeared in the USA (Helios Apollo in the UK). It's in very good condition, optics are clean and unmarked, hinge and individual eyepiece focusers are appropriately taut but smooth, case is clean inside and out, and I think the original cleaning cloth is still unused (I never manage to fold them away that neatly). The objective caps are tethered; the eyepiece caps are the tethered "rainguard" type. Spectacle-wearers NB: The eye relief is specified as17mm but, with the rubber eyecups folded down, the eyepieces are recessed 7mm, so only 10mm eye relief is 'available'; so make sure this is enough for you. £140 plus your chosen method of shipping at cost (or free collection). Bank transfer or PayPal nett of fees.
  12. Need to clear a bit of space on the binocular shelf . First up is a Frank Nipole 10x50. The good: With the exception of the bad, it is in good nick. Coatings are intact, no evidence of fungus in lenses, Hinge, focus and right eyepiece dioptre are taut but smooth. Exterior in good nick, no dings. leather strap in remarkably good condition. The bad: It's out of collimation. Badly. There's about 30 arcmin of step in the image (i.e. one image is about 1/10 of the FoV below the other). The closure tab on the case-lid has broken off and been lost. One of the objective caps is non-original (but fits). It's spent the last few years waiting in vain for me to get round to mending it; at this rate, I'll probably be pushing up daisies before I get around to it, so it probably ought to go to someone who will give it the TLC it deserves. Collimation is by eccentric rings on the objectives; you'll need to obtain (or bodge) the appropriate peg spanner. There are scratch marks on the rings that suggest someone has tried (or maybe made it worse, which is why it's so badly out). Anyway, it's free to anyone who will come & collect, or pay P&P at cost (bank transfer or PayPal nett of fees.
  13. In the S of England next week? Lilian's a great speaker. 'How Astronomy has Changed' by Dr Lilian Hobbs: Astronomy talk at Bournemouth Natural Science Society, 2017 April 11, 19:30. FFI: http://bnss.org.uk/
  14. Thanks for the heads-up; I'll have a look for it.