"Boat" telescope
 

My daughter is sick so I have to stay home if she needs me. There is
light rain from Fay so no working on the boat.

So..........start a project I have been planning, a boat telescope.

I like casual astronomy just a little better than 7X50 binocs and I
know about optics and ground a telescope mirror when I was a kid. So,
this project is a 4" diameter mirror of only 20" focal length and low
magnification for very wide field of view.
After 1st half hour of rough grinding, I have a definite bowl in the
mirror.

"Boat" telescope
 

wrote in message
...
My daughter is sick so I have to stay home if she needs me. There is
light rain from Fay so no working on the boat.

So..........start a project I have been planning, a boat telescope.

I like casual astronomy just a little better than 7X50 binocs and I
know about optics and ground a telescope mirror when I was a kid. So,
this project is a 4" diameter mirror of only 20" focal length and low
magnification for very wide field of view.
After 1st half hour of rough grinding, I have a definite bowl in the
mirror.


Put that aside and build a miniature version of this instead:

http://www.space.com/scienceastronom...or_000924.html

Eisboch