On 9/6/11, Chuck Hards <chuck.hards@gmail.com> wrote:
If you want to make a small, dedicated white-light solar scope, you can install the filter material JUST behind the objective.
Just to clarify, this works for refractors, SCT, and Maks ONLY. For SCT and Maks, it must be just behind the corrector plate, with a central hole for the secondary, but be very careful to make sure the seam between the filter material and secondary is light-tight. You can't put it just in front of a Newtonian mirror, at the bottom of the tube, because of reflections off the front of the mylar. Contrast is reduced too much due to bright internal reflections off the filter material. Makes the most sense with small refractors of 80mm aperture and below, SCTs and Maks are overkill.