Below is the second scope I built, for my son Isaac; at the time this
picture was taken he was still a bit young to enjoy it.. It's a very
compact 4.25" f4 Dobsonian. I just made up the design as I went.
The entire thing weighs 8 lbs and is virtually indestructible. Although
the mirror is smaller, with such a short focal ratio it was a challenge
to figure accurately. With a low power 25 mm eyepiece this telescope
has a massive 3 degree field of view.