Moon bombing

[Chuck Lee]

I would have liked to get a wider view but the 5DII won't come to focus in the 12 1/2" without a barlow.

Cool Shots Jon.


I must confess, I had to wiki "barlow".

[Colin]

Fantastico!

[Jon Ruyle]

Thanks!


A barlow is just a diverging lens. Unlike extenders for lenses, there is little or no image quality degridation associated with them. Not sure why. Maybe it is because with telescopes people seem compare like fields of view rather than 1-1 crops. ie, they do the equvelant of comparing the 1200mm focal length scope with a 600mm one cropped so it has the same field as the 1200mm.