Hi Ken,
I read your article on the final spectroscope design with interest. A colleague has given me some optical fibre which I've been playing around with, and trying to get light through some diffraction film. The fibre works OK and I'll be making up one of the designs shown in the attached file.
They are fairly close copies of the designs Christian Buil has on his website, mainly his MERIS s/scope.You mentioned Optometrics as the preferred grating, would it be the model 3-3650? It's a 600 lpm, 500nm blaze, 30x30x9.5mm in size.
Any comments on the proposal are welcome, particularly the choice of the grating, 600 v 1200 lpm??
I would also look at making the 26mm eyepiece+fibre connection a single item. That way it could become a bit more portable between telescopes??
Regards
Mark
