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About theastrodragon

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    Star Forming
  1. 12" F4 Orion Optics VX series Newtonian. Dual speed focusser, finder, professional grade optics, all in excellent condition - only used a few times, was originally bought for a project I decided not to do. Current retail around £1350, offering at £625 - because of its size, needs to be collected, too big for me to ship I'm afraid. I'll also include a pair of tube rings with a Losmandy plate to mount the scope.
  2. Takahashi FS-152 F8 for sale. This is the big one, Flourite lens (before they stopped making them). In excellent mechanical and optical condition, gives amazing visual views. A classic Tak scope. Selling due to health issues. £4,500 ono.
  3. 5 minutes shouldn't be showing field rotation, and 3' isn't that bad an alignment. A quick look at the image shows the eggs aren't in the same orientation (if they were, especially in RA, I'd suspect trailing). It could be collimation or field flatness.
  4. Rather than a Barlow, why not go for a ccd with small pixels that you can normally use binned. Then rather than use a barlow, don't bin. In my case, my SX814 would give me 0.67"/pixel, which is way too small for normal UK seeing, so I use it binned at 1.3"/pixel for most things. The only time I use it unbinned is for planetaries, where they are small and usually high surface brightness, and look rather tiny when binned.
  5. I'm not familiar with EQMOD, but I see an HEQ5 reporting a PEC of +/- 0.04 arcsec suspiciously amazing. Heck, it would be pretty amazing if guided, let alone unguided. It does make me suspect something is amiss with the reported errors.
  6. I don't have any problems, but my USB connection is from the mount saddle. What connections are you losing? The OAG and the filter wheel use short cables, so they shouldn't be under any strain. If you have a longer connection, try fastening the end part (the camera size) to something to avoid the mini-USB connections bending or pulling out.
  7. Personally they are going to have to pry Win7 out of my cold dead hands...
  8. You don't see many specialised planetary scopes any more. Nice.
  9. Orion Optics VX12, in excellent condition. About 2 years old, no longer needed. Professional Grade quality mirror, twin speed focussing mount, basically as the description on the OO page Comes with tubs rings connected to a Losmandy-style plate (not shown on photo) £700 (due to its size, buyer collect I'm afraid, I can't ship it)
  10. It depends on the brand. On some, there is no real gap between the red and green filters. On others, there is a deliberate small gap to block the Sodium D lines. However looking at a street light doesn't work well, they are too bright. If you can, try looking at some low-altitude orange sky glow and see if it does much to that.
  11. I save the master flats and the images. I usually archive off the raw images after a while, just keeping the stacked ones for later re-work. Big hard disks are cheap, and with the number of clear nights we get in the UK it takes a long time to fill one, even with big images.
  12. You're probably looking at which one has the best cooling. Atik claim -30 (although I am a little concerned on this given the camera casing design, its not the best one for encouraging cooling) QSI claim -40 (and their casing design looks more likely to meet this) You might also check out Starlight Xpress and SBIG. SX cool to -50/-55 below ambient (and their case and fan designs do provide this) SBIG also claim -50/-55 below ambient. Both the SBIG and SX designs will get you down to a very useable temperature even in an ambient of over 25 C. Atik wont, QSI might.
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