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Found 3 results

  1. Hi For various reasons, I find a correctly orientated image, (vertically & horizontally) as given by an Amici prism in a diagonal, much easier for me to use with my observing. I absolutely loved the Baader Amici prism with the ClickLock. The build quality is lovely and it gave really great views - except when you try and use it on an object brighter than about magnitude 1.5, whereupon you see the infamous diffraction spike ruining your view. I know this is a fairly common issue with prisms and with Baader Amici prisms in particular but I have also heard of people trying several and then finding one without the diffraction spike issue. Mine was bought from a reputable online only astronomy supplier on the USA west coast who assured me they tested the prism prior to my purchase but they obvioulsy did not. They did give me a refund in the end. I would really love to try and obtain another Baader prism but without the diffraction problem. My question is, have you done the process of trying several prisms before getting a good one? Who did you use? (please feel free to PM me) Did you end going directly to Baader? I would do that ordinarily but I now live in the USA, not Europe. Have you another non Baader correct orientation prism that you could recommend to me ? (Although I have to say once you use a Baader diagonal with a ClickLock there really is no going back to the fiddly adjustment screws!!!) Thanks for any advice, sharing of experiences or recommendations. Siouxsie
  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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