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73498Re: [ccd-newastro] Weird curvature with Hyperstar lens

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  • Ron Wodaski
    Oct 19, 2013
      Never seen that, but generally, with very fast systems, spacing is critical.  The first thing I would check is that every part of the system is where it is specified to be.  If you have any extras in the imaging setup, remove them and go to factory spec.

      It may also be that your camera covers more than the available flat field. 

      Sent from my iPad

      On Oct 18, 2013, at 23:15, Mark Striebeck <mark.striebeck@...> wrote:

       

      Hi,

      I spent quite some time collimating my hyperstar lens. I could get almost all collimation out, but a pretty strong and weird curvature remains: http://goo.gl/cVH6h7

      Does anybody have any idea where this comes from - and how to fix it?

      Thanks
           MarkS

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