Quote:
Originally Posted by lesbehrens
i also notice that there are scopes with different lens type. eg Lunt 60mm Ha Telescope (B1200) / (B600) is that correct?how does this make my viewing better?
les
|
I believe that this refers to the diameter of the blocking filter (usually in the diagonal), so that would be 12 and 6 mm respectively. This means that you have a slightly larger FOV as this works as a field stop. With the 40mm scope and a 5mm blocking filter I have no problems getting the whole disk of the sun in the FOV with an 18mm eyepiece. At 60mm (not sure what the focal length of the Lunt scope is) with all other things being equal I think I'd struggle, but 6mm sounds about right. Maybe someone else who has a larger blocking filter can comment.
I would think that the Lunt and Coronado scopes should be pretty similar in performance.
Cheers
Stuart