|
In most cases the use of a diagonal on a newtonian will prevent focus being reached without moving the main or secondary mirror to take care of the extra length. However if you must use a diagonal you could try this:
If the nose of the diagonal is threaded it may accept the lens from a barlow (mine does). Then use a longer focal length eye piece to compensate. I have used this idea many times to increase the focal distance.
Barry
|