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0.5x Focal reducer for 80ED

  • DaveGrennan
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  • IFAS Astronomer of the Year 2010
  • IFAS Astronomer of the Year 2010
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18 years 7 months ago #27847 by DaveGrennan
Replied by DaveGrennan on topic Re: 0.5x Focal reducer for 80ED

Unfortunately the scope is a newtonian! BAH!


Matthew, the answer to your problem might be to replace your focusser with a low profile focusser allowing you to get your dslr and 40mm eyepiece in closer to the tube.
Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
Equipment List here

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18 years 7 months ago #27848 by dave_lillis
Replied by dave_lillis on topic Re: 0.5x Focal reducer for 80ED

Unfortunately the scope is a newtonian! BAH!


Matthew, the answer to your problem might be to replace your focusser with a low profile focusser allowing you to get your dslr and 40mm eyepiece in closer to the tube.


Thats a good idea worth exploring.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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18 years 7 months ago #27849 by TrevorDurity
Replied by TrevorDurity on topic Re: 0.5x Focal reducer for 80ED
Matthew,

I had the same problem with my Newtonian. The answer was to use a Baader MPCC (Multi Purpose Coma Corrector). This moved the backfocus out by around 10mm and I then had no problem reaching prime focus with my DSLR. In addition it got rid of almost all coma in the scope.

Since you are in Galway you are welcome to borrow mine for a time. Your 300D T-adaptor will thread straight in. You must have a 2 inch focuser though.

More details on the device here
www.telescope-service.com/baader/accesso...ccessories.html#mpcc

Trev

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