20" DOBSONIAN

[DAVE AMENDALL]

I see Telescope House have the big Dobbie back in stock. Should be able to find it in the dark but don't trip over the step ladders...Dave

[alanjgreen]

Dave,

Its f3.6 (same as mine) so NO step ladders needed!

Here are the numbers (from TH site):
DIMS total: 680x680x1790mm; Rockerbox 678mmx678mmx347mm;

Mirrorbox 590mmx590mmx361mm; Trusses approx. 1084mm;

Truss diameter: 25mm;

Eyepiece height while pointing at zenith approximately 1,63m;

20“ Total net weight: 53 kg;

20“ Mirror Box + Altitude wheels: 35,8kg; 20“ Secondary Cage: 3,8kg; Rockerbox: 10,6 kg; 20“ 4 Truss pairs: 2,8kg; 20“ Primary mirror: 20kg

https://www.telescopehouse.com/telescopes/explore-scientific-ultra-light-dobson-20-f-3-6.html

 

At over £6K, I would be looking for a nice custom build and UK made mirror (for a little bit more money).

Alan

[DAVE AMENDALL]

Wow! at F3.6 the views must be magnificent. I would imagine with that quality mirror the edge of the field would also be excellent. The step ladders was just a pun based on an old photograph of a 16" F10 I happen to have.....Dave

[Paul73]

6 hours ago, alanjgreen said:

At over £6K, I would be looking for a nice custom build and UK made mirror (for a little bit more money).

Agreed. Doesn’t seem like good value.

I’m guessing that ES may just want to be seen in that market to enhance the band. It’ll probably work well enough and give anyone who takes the plunge some stunning views.

Paul