Does the crop of the 2.5x NFK eyepiece obscure the curvature of non-Plan Olympus Objectives?

[MicroMan2]

Hello I have a question with regards to the use of non-Plan finite Olympus objectives for the BH2 with the 2.5NFK Eyepiece. If I am using a APC sensor camera, does the excessive crop remove the curvature of the aforementioned objectives? I am considering the purchase of either the DApo Oil 40x 1.30NA or even the UVFL with the same specs and I wonder if the mismatch of the APC/2.5NFK in this case would be an advantage?

[PeteM]

The crop will certainly help. In addition, if you plan to do focus stacking that will also make most of the curvature seen in a single shot go away.