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West End Wendy

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Everything posted by West End Wendy

  1. I've never found any light pollution filter that really makes much difference for visual use. Others have very different opinions, so the type of light pollution in the local area must make quite a lot of difference. I think most would agree the neodymium is useful on Jupiter and Mars though. Tim
  2. Oops - forgot to add it to the sig. Only got it a month or so ago.
  3. I sold my 2.5 powermate a few months ago and bought a TV 2x barlow. I did this mainly because the 2x was a more useful magnification factor for me, but I also felt that I could put the money I got for the powermate to better use. For the price I got for the PM second hand I bought the TV barlow and the Revelation 2.5 x. The PM was excellent, but the standard barlow is just as good for my purposes. Maybe the imagers feel differently. Tim
  4. It seems to have magical battery-preserving qualities too. I've not changed the batteries in mine in over a year and I have been known in that time to forget to turn it off for a couple of days. Tim
  5. I've just been out looking at Mars with various eyepiece/barlow combinations and the best view I had was the rather incongruous combination of a 10mm Ethos and the 2.5 Revelation barlow. £500 eyepiece and £35 Barlow. It certainly holds its own in illustrious company. Tim
  6. Talking of Giles Sparrow, the big coffee-table Hubble book that he's the writer of is not just a book of pretty pictures - it's also superbly written and informative.
  7. The Night Has A Thousand Eyes by Arthur Upgren. Inspiring, informative and no telescope required. Tim
  8. Just found your blog entry on the subject Rik - really useful info, even though I'm not an imager.
  9. When viewing Mars I always get a slight blue glow on one side of the planet, and a red one on the other. As I understand it, this is atmospheric refraction. I notice it particularly on Mars and Venus, I don't remember it ever bothering me on Jupiter, Saturn, the Moon or bright stars. I expect to see it when planets are low in the sky, but Mars is at a reasonably high altitude right now and it's still pretty noticeable. Is atmospheric refraction visible in all types of scope, and what can be done to minimise it? Cheers, Tim
  10. Sky Safari is absolutely awesome, and gets better with every update. It's far more of a serious astronomer's tool than Star Walk. There are versions for all pockets, too, with varying numbers of stars in the catalogue. I have an IPhone rather than an iPad, so can't really comment on iPad use, but a friend of mine was using Star Walk on the iPad and was having problems getting the compass to work. More likely to be an issue with the iPad settings than the app, I suspect. Tim
  11. I think it's worth mentioning that doublets such as the ED PRO 120 do have certain advantages over triplets - they're cheaper, lighter, require less cool down, and at the lower-price end of the market at least, you're less likely to get a poor-quality doublet than a poor-quality triplet. The step up from achro to ED doublet seems to me to be a lot less painful than the step up to full APO and the penalty is a tiny increase in CA which, in focus at least, is barely perceptible visually. Tim
  12. It is on this page - the actual eBay listing starts about half way down the page - £6.49.
  13. Yes that should work just as well. I'm a little squeamish about having 240 volts out in a damp garden, but I guess I mow the lawn and don't worry about it.
  14. Like this one. http://www.ebay.co.uk/itm/290563099703?redirect=mobile&autoredirect=off
  15. The Skywatcher power tanks have 6v coaxial outputs, they start at about 50 quid for the 7aH one. Any of the Maplins power supplies with a cigar lighter output can also be used with a 6V cigar lighter lead - you can get the cables from eBay with selectable voltages. Tim.
  16. Yes that does ring some bells, although I only really go back to Tom Baker with Dr. Who. I do love a good ridiculous Sci Fi plot though. The Daleks killing everyone on the Marie Celeste is my favourite.
  17. Yes - I have to admit I was rather interested in that too (was it a 127? I want one). Thanks for the other film reccomendation, I'll check it out. Von Trier is guaranteed to polarise opinion. I thought Melancholia worked really well, but I do find some of his stuff almost unwatchable. Tim
  18. Saw the film Melancholia last night. It's an interesting film - a piece of art house cinema with a disaster movie plot. Anyway, the basic premise is that a planet hiding behind the sun breaks out of its orbit and starts on a collision course with Earth. There was, of course, a time when scientists believed there was a planet hiding behind the sun, and only Einstein and gravitational lensing ended that theory of explaining Mercury's non-Newtonian orbit. So of that bit is possible, could, in theory, the rest also be also? What force could move such a planet out of its existing orbit? A collision with another body perhaps... Ok, the film is an allegory not a piece of science, but it's always interesting to think about such things. Tim
  19. That's brilliant - it never occurred to me that the aperture mask would change the focal ratio, but of course it does. How can it not? Tim
  20. Rother Valley told me back in early Jan they would be getting some in soon, but as yet they don't seem to have materialised. Scopes N Skies said they had no plans to re-stock it. I bought one from the States too. It's expensive after all the charges have been added. Tim
  21. Excuse the ignorant question, but how do you get your eye anywhere near the eyepiece on a dob that size? Looks like you'd need a fork lift truck. Tim
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