Quote Originally Posted by E. von Hoegh View Post
Simple as dirt. Place a 5x achromatic loupe at the focal point of the lens and you'll have a 23.5x telescope. Use a 10x (1") loupe and you'll get 47x, the focal length of the eypeice lens divided into the objective lens give you the magnification. Of course, you also have two doublets with focal lengths of 96" or so....
And don't look into the sun - not even by accident !!!

Bert from Holland