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Found 3 results

  1. I have been taking a bi-color narrow band image of the witches broom. I want to add in some star color using a CLS filter. I use a 130P-DS and I am a fan of diffraction spikes and want to see some nice well defined spikes on the brighter stars without blowing out their color. Would I be better off trying IS0400 with a longer exposure or ISO800 with a shorter exposure to achieve this with my 1000D DSLR?
  2. Does anyone know what the strange diffraction spikes are in this image? I know the star Alnitak is pretty bright but wasn't expecting this. I've never seen this happen before. Is it an SCT thing, or a MY SCT thing? I've seen straight diffraction spikes, but never curved. Is there anything I can do to stop this? Could it be a collimation issue? I did check before I started imaging, but thought everything looked ok. My scope is a Celestron C9.25 XLT, and I'm using a f/6.3 corrector/reducer with modded Canon EOS 600D. Thanks in advance
  3. Was just thinking.. If the total diffraction depends upon the thickness of the spiders' vanes, then wouldn't it be a good idea to sharpen the spider? Bit like a double edged knife, all four or three vanes... any ideas or experiences with this?
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