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From what I've seen, providing there are no serious kinks in the fibre, the transmission losses are pretty low ( that's why they are used for broadband) The losses occur on the inlet and outlet. For a spectroscope application the f ratio's and NA really need to be considered.
( the resolution of the flouro spectrum isn't as good as you achieved previously??!)
BTW I've just finished the conversion of a Vixen flip mirror to a beamsplitter. ( The vixen has a SOLID 2" nosepiece and T threads on the body at both the guide and imaging side - ideal for connecting to spectroscopes etc) removed the original mirror and drilled a 12mm hole through the "flip" platform then placed a 70/30 beamsplitter ( Ex our friends at Surplus Shed!) on the front. Aligned with a laser, using the small 1.3mm grub screws on the platform and it looks good! Much better than the Meade OAG design or the Vixen cube option.
(There's quite a series of postings from Richard on the Amateur Spectroscopy forum re fibre optics)
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