Leica DMR Magnifier Lense and TL Lenses

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Regarding Leica DMR's, the lenses above the filter cubes, (typically where a Bertrand lens is located) is there aberration correction being done there? Or is there any correction in the tube lens in the head?

I'm assuming that the DMR trinocular head has the tube lens.

Basically, can I replace the head with a Edmund Optics or Thorlabs 200mm tube lens and still use Leica DMR objectives?

The picture shows the Bertrand lens and magnifier. Note there is no pass through. Only the confocal has a pass through that I've seen.

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The manual isn't helpful on confirming TL or not for 15 versus 16:

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Ok found a page that seems to say that the non-Bertrand lens above is a 200mm 1x Telan lens with corrections.