Alternatives for Nikon BD objectives?



I recently bought a Nikon Biophot photomicroscope with a second,
interchangable, Metaphot 'arm' that can be used for reflected light.
There are only two objectives in the revolver, 20x and 40x, both BD
(reflected light brightfield and darkfield).
I would like to have 2 more, like a 5x and a 100x. So far I didn't see many
BD objectives for sale (second hand), and if they are they are quite
expensive (not much budget left ;-) ).
They have a tubus length of 210mm.

Are there other objectives that can be used? Like Olympus NEO?

Thanks for any information!


Theo


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