Unidentified American Optical attachment for series 10

[XrayOptics]

I have an attachment that came with an AO series 10 microscope, but I am not quite sure what it is as I can’t find it in any of the AO catalogs I have found online. It has a 45 degree angles glass reflector (not a prism), and a light blue lens and filter slot in the tube coming off the side. Looks like some sort of vertical illuminator. Any ideas?

Thanks

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[PeteM]

It's part of an epi illuminator, missing the lamp and lamp attachment. A.O. made a series of episcopic (reflected) objectives for it, which usually accompanied one of their industrial series scopes (#3000-something). Still, you could add a DIY LED illuminator and play around with it with your series 10.

[MichaelG.]

Further to PeteM’s identification … do take reasonable care when handling it: that ‘pellicle’ may [for good optical reasons] only be the thickness of a coverslip.

MichaelG.