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60775Re: [ccd-newastro] focusing dslr

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  • Murray Hammick
    Jan 1, 2008
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      You can also use a separate focusing aid such as the Stilleto Mk IV which can sometimes be found second-hand on Astromart or similar sites for reasonable prices. A new one is in the order of about $250 (I think).


      Bill Logan <wb9sat@...> wrote: Digital cameras, unlike film cameras must be fine focused on the pixel
      level. You can get a rough focus through the viewfinder, but final focusing
      must be done by looking at FWHM (Full-Width, Half Maximum) numbers. You can
      use an inexpensive digital capture and processing program such as Stark-Labs
      Nebulosity. Nebulosity has a fine focus routine that allows you to fine
      focus using FWHM.

      Clear skies,

      Bill Logan
      Robert Burnham Jr. Memorial Observatory


      ----- Original Message -----
      From: "firebirdthart" <thart40@...>
      To: <ccd-newastro@yahoogroups.com>
      Sent: Monday, December 31, 2007 5:36 PM
      Subject: [ccd-newastro] focusing dslr

      > Is there a better way to focus the canon xti than through the view
      > finder, any way to send image to computer possibly?
      > Yahoo! Groups Links
      > --
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