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Building & optimising a 20-inch Dob

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#1 Mark Radice

Mark Radice

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Posted 01 November 2021 - 12:40 PM

We had lovely clear skies at England’s Kelling Heath star party - even if the dew was horrendous!

 

My golden rule of star parties is to set up next to someone’s big dob so I was lucky to be near Alan Marriott’s 20-inch homemade dobsonian. He has put together a wonderful set up with GoTo and tracking, plus improved primary & secondary collimation, wheelbarrow handles and a rotary filter wheel.

 

I uploaded a video as Alan talks myself and fellow club members through his design and build before we diverge off into deep sky observing through a big scope.

 

reduced picture.jpg

 

Very useful content if you are building (or planning) a big scope or even just thinking of getting a big dob.

A beautiful instrument and the views of the Orion nebula in the small hours of the morning weren’t too shabby either!

 

reduced IMG_5875.jpg


Edited by Mark Radice, 01 November 2021 - 12:42 PM.

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#2 Mark Radice

Mark Radice

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Posted 01 November 2021 - 12:42 PM

And a few more pics showing the secondary collimation and the wonderful control box. 

Attached Thumbnails

  • reduced IMG_5891.jpg
  • reduced IMG_5904.jpg

Edited by Mark Radice, 01 November 2021 - 12:44 PM.

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#3 Taosmath

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Posted 01 November 2021 - 01:11 PM

I like the rotational adjustment screws on the secondary.  I think I'll try that on my scope.




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