Refractive index mismatch in confocal

Hello everyone,

I was wondering whether there are any easy solutions for the refractive index mismatch when using general air or water-immersion objectives in confocal set-ups.
In SPIM set-ups this is easy to correct, at the end using one lens the light can be re-focused.
By now in confocal this issue seems to be solved using multi-immersion lenses or refractive-index matched objectives.

Does anyone know any generic correction collars that could be attached to any objective?
Or have anyone came up with a nice solution?
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