Here are some photos of the secondary holder and the filter slide.
A good microscope has a set of good quality eyepieces and a set of good quality objectives - why not a good telescope? Having bought a set of good quality eyepieces why should I only use them on a high power objective. This type of mounting and truss in particular is very suitable for mounting medium and low power objectives.
So I have mounted a 5.5" F3.5 Comet Catcher as the medium power objective, having modified the focuser to take 2" eyepieces. With the 22N This gives a field of 3.6 degrees at 23X. The 31N will also fit but gives an exit pupil of 8.6mm so the effective aperture is probably about 4.3" but the field is 5 degrees.
I am thinking of fitting low power objectives with focal lengths about 200mm and 50mm as well. The very low power objective would have a field of 40 degrees - Gum Nebula perhaps.
The filter slide is a dream. Just pull it out of the eyepiece box and plug it in - filters already loaded. Easy to compare filters and to examine an object in different bands.
The secondary holder is very light and rigid as the overhang is very small. I have bent the rules but not broken any.
See you at SPSP Mike - another long session coming up?
