10x water objective acquired

I recently acquired a few interesting objectives like a MPlanFL N 5x/0.15 to replace my MSPlan5x/0.13, but the most interesting one is this UMPlanFL N 10x/0.30 W water objective.

Unlike immersion objectives the working distance is not short (3.5mm) so you need to dip the objective in a “pool” of water. I use a 3d printed part fixed with double sided tape for the pool. I mounted the die with bee wax on a coverslip and pressed the coverslip in the pool.

The results are definitively interesting. While the dry MSPlan 10x/0.30 objective have colorful images because of interference…

… the water objective is much sharper, contrasted and seems to have more resolution. All interference seems to be completely gone and we can see through dirt.