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About reezeh

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    Star Forming

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    Astronomy, photography, playing chess badly and telling jokes that'll make you groan
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    About 53º47'N 1º47'W

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  1. Probably ones like that and others that'll probably be moderated or get me a ban for even mentioning them
  2. I was just going to add this as an edit to my reply...
  3. I think that'll be called an asterism. Somehow I don't think the IAU will be in too much of a hurry to add that as an 89th Now if you could find a Trek-inspired reference; say, The Klingon's Forehead it'll probably be official faster than you can say "beam me up Scotty"
  4. FLO need a new sticker, especially for me: "LIGHT POLLUTION GUARANTEED"
  5. I wondered if how good a filter wheel would be for visual
  6. There"s nothing like old books and nostalgia
  7. It's a photography term originally; faster meaning lower focal length to aperture ratio, slower being higher ratio. It basically means that lower f- number makes a brighter image than a slower or longer lens (or mirror), which results in faster shutter speeds. Another way to look at it is that faster makes a smaller image at point of focus and compresses the available light tighter. Slower optics magnify the image, or spread out the light, making it dimmer. Eyepieces are often suited or designed for faster or slower optics. For instance, the much maligned Huygens is an atrocious perf
  8. Indeed: why the insistence on colour index? Personally, I've always had a fondness for low pressure sodium yellow. The pure yellow colour I find appealing and it has the advantage of of being very easy to eliminate. I dislike high pressure sodium though as it is all over the spectrum so is harder to filter out. So LCDs that are true LPS yellow would be a boon.
  9. I'm all in favour of the technology as long as used properly. I think if they could be made so that they are narrow band; ideally low pressure sodium wavelengths only, shielded and fitted with passive infra red detectors so they only are active when needed they would be the best thing since dark skies. It won't be perfect, but it'll be the best compromise possible for all. I do hate garden lighting and floodlights that are forever on. My neighbour has one that is on sunset to sunrise and there's absolutely NO off switch! The housing association or whatever it is that is responsible has fitted
  10. Going by the rules it's where the ball is in the logo!
  11. Reminds me of the pet football I had that I named Spot Oops sorry wrong thread!
  12. Fair enough. Not everyone is and tastes and interests change. I'm increasingly seeing the appeal, being hampered by light-pollution and work hours keeping me from enjoying the night sky as I would "reasonably" like.
  13. If you're ever planning on H-alpha solar I can't see any disadvantage at all. CA should not be an issue, saving you a lot of money over an apo. And aside from imaging an achromat isn't a big handicap. Go back not a million years and achromatic refractors were seen as serious kit well worth having. A six inch achro was "THE Mars scope to have" A good telescope is anything you're using and looking through. If it shows you things, then it's a good scope. Edit: Additional: talking of solar, even white light and projection is something suitable for an 80mm achro. The just above 1
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