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Based on slit image (first pic from previous post) and measured fiber diameter (0.12 mm, 40 pixels), effective slit width is ~6 pixels, ~18 um.
Please note, this measurement is done without any optics.. and the scope I intend to use will be Rubinar 8/500 or Samyang 500/ f6.3.
And, if higher f/number for colimator (Industar 50) is used (currently 3.5, wide open), the effective slit width could be reduced to <5 um.
Not bad for the price I paid for it :-)
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