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Knight of Clear Skies

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Knight of Clear Skies last won the day on October 10 2017

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About Knight of Clear Skies

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    Red Dwarf

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    http://www.caradonobservatory.com/

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  1. Decent enough image but it's not focused on infinity, so doesn't help with the diagnostics I'm afraid. A quick snap of the Moon might be easiest way to test it.
  2. Could be that the lens simply isn't reaching focus with the M42 adaptor, my modded 1100D had the sensor re-shimmed to ensure infinity focus with camera lenses. Another modded camera I've used will reach focus with some lenses but not others, it's fine with modern auto-focus lenses and telescopes as they will go past infinity but not all combinations of M42 lens and adaptor will work with it. Some adaptors are thicker than others and move the lens further from the body, a thinner one may work. Notice that the nebulosity isn't in focus. Alternatively it could be some kind of internal reflection in the lens, possibly a problem with the coatings. There were applied to the lens 50 odd years ago and who knows what's been done to them since (an overzealous cleaner might have worn them away). I'd recommend trying the camera with an auto-focus lens to confirm there isn't a problem there. You could also try the Takumar on a distant target in daylight, or on the Moon. Hope that's some help, in its current form at least it gives quite a nice artistic effect.
  3. It was a single 1-minute exposure at ISO 800. I'm lucky to be shooting from the edge of a dark sky park and the comet was particularly well placed to the north, there are no towns in that direction until you hit the coast.
  4. I shot it from Bodmin Moor, Cornwall, recognised by the IDA as a [dark sky landscape](https://www.darksky.org/bodmin-moor-first-uk-area-of-outstanding-natural-beauty-to-achieve-ida-dark-sky-park-status/). It wasn't quite full astro-dark but pretty close, the Milky Way was very bright.
  5. Thanks everyone, glad I made the effort. Very clear, tail was a good 6 degrees to the naked eye. I was at a dark site on the edge of Bodmin Moor but I friend of mine was able to see it from Plymouth.
  6. Thanks. Not a great deal, slight local contrast enhancement using Noel's actions in PS (layer on top and about a 30% blend). Interesting question. The ion tail is more affected by the solar wind than the dust. Possibly they could diverge more the further the comet is from the Sun as the radiation pressure drops off with distance? But it could be difficult to tell as the appearance depends more on the viewing angle.
  7. Just a one minute exposure of comet C/2020 F3 from last night showing an ion tail at least ten degrees long. Samyang 135mm f2 and Canon 700D.
  8. Thanks Rodd, think I'm looking in the right spot now.
  9. Have I caught it in this wide but shallow mosaic or am I looking in the wrong place please?
  10. https://skyandtelescope.org/astronomy-news/astronomers-discover-huge-circular-arc-near-the-big-dipper/ 30 degrees long, that's three times the apparent size of Barnard's Loop. Here's the MDW survey image.
  11. The 250D should be good for AP although it would require modification (removal of one of the IR filters) to give the best results on nebulae by improving its sensitivity to Hydrogen-Alpha emission. There are some very large DSOs up there that don't require long focal lengths to image. For example, this is a 2-minute exposure of M31 at 135mm after a quick image process, taken from a dak site.
  12. The Takumar 135mm f3.5 is a good budget AP lens. This is my most recent effort with it, with Ha data blended in from my Samyang 135mm f2.
  13. Agree with the above, I'd think more about the camera than the scope. I'd just like to add, guiding isn't essential with a low-read noise CMOS camera. This was taken with 30 second unguided subs using the 1600MM cool.
  14. I have both an unmodded 6D and an old modded 1100D, the latter offers better value for money. Here's an example image taken with a kit lens.
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