Loading ...
Sorry, an error occurred while loading the content.

Re: [sct-user] Use of Skylight filter

Expand Messages
  • John Mahony
    The rear port on most SCTs has an ID of about 1.5 , so you wouldn t lose much with 36mm, but the geometry of the 9.25 is slightly different, and I ve heard
    Message 1 of 2 , May 1 12:04 AM
    • 0 Attachment
      The rear port on most SCTs has an ID of about 1.5", so you wouldn't
      lose much with 36mm, but the geometry of the 9.25 is slightly
      different, and I've heard that the rear port is a little bigger- about
      1.75" ID, so it might be noticable in EPs with a wide true field.
      -John


      --- seasparky2001 <seasparky2001@...> wrote:
      > Group:
      >
      > I had been using a Celestron Skylight filter on my C9.25 (with 1-1/2"
      >
      > visual back, diagonal and eyepieces) mainly to prevent contaminents
      > from entering the OTA. It seems to have worked well, with no
      > noticeable degredation in optical performance. Now that I have
      > upgraded to a 2" eyepiece system, I am concerned that the Skylight
      > filter may be too small for the 2" format. The actual filter glass
      > diameter is 36 mm. I have not seen any larger diameter skylight
      > filters advertised by Celestron or Meade, so I was wondering if this
      > really is an issue with the 2" format. Your comments are much
      > apreciated.
      >
      > Stan
      >
      >
      >
      >
      >
      >
      >
      >
      > ------------------------ Yahoo! Groups Sponsor
      > --------------------~-->
      > What would our lives be like without music, dance, and theater?
      > Donate or volunteer in the arts today at Network for Good!
      > http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/1.XolB/TM
      >
      --------------------------------------------------------------------~->
      >
      >
      > Visit the sct-user home page at:
      >
      >
      >
      > http://members.aol.com/RMOLLISE/index4.html
      > Yahoo! Groups Links
      >
      >
      >
      >
      >
      >
      >
      >

      __________________________________________________
      Do You Yahoo!?
      Tired of spam? Yahoo! Mail has the best spam protection around
      http://mail.yahoo.com
    Your message has been successfully submitted and would be delivered to recipients shortly.