Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Celestron Comet Catcher

  • Please log in to reply
126 replies to this topic

#126 DAVIDG

DAVIDG

    Hubble

  • *****
  • Posts: 12,821
  • Joined: 02 Dec 2004
  • Loc: Hockessin, De

Posted 02 November 2024 - 07:21 PM

I seem to remember that the Meade SN reduced it more or less by 1/2, for some reasonable definition of 1/2. Imagers seemed happy with it. I had a 10" which was very average optically, but the imager I sold it to was very satisfied.

 

-drl

 If you place the corrector at the radius of curvature of the primary mirror then the coma is fully corrected but you have a tube that is twice as long. You also need a larger primary to have fully illuminated field. So you now have  a Schmidt camera with a secondary in place of the film holder. 

 

                - Dave 


  • deSitter and Terra Nova like this

#127 ccwemyss

ccwemyss

    Gemini

  • *****
  • Posts: 3,152
  • Joined: 11 Aug 2016
  • Loc: Massachusetts

Posted 02 November 2024 - 08:19 PM

 Sure, but then you lose the coma correction that a Schmidt Newtonian has which  for  a given focal length is less. So at F3.6 that coma would be much worse. The reduced coma is one of the reasons that Comet Catcher was  designed for wide field viewing.

 

            - Dave 

Or, you just change the label to Coma Catcher after removing the corrector, and then it meets expectations. wink.gif

 

Chip W. 


  • deSitter likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics