Did not mean to upset you. I was merely trying to relate in a light hearted way, that I didn't think that having an OLPF on the D750 would be causing soft shots such as Don was describing. I have no doubt that with the filter removed, the D750 is an even more awesome camera then it is with it.
No offense taken, I was still on my first cup of coffee and a little cranky when I typed that.
.....
I have to agree with the D750 being softer because of its filter. I clearly notice the difference between my D750 and D810/D7200 when it comes to sharpness. It having the biggest sensor pixels isn't helping either.
I'm not sure if the D7100 has an OLPF but if not, the problem might partly be situated there.
Someone should check to make sure, but I'm 99% certain neither the D7100 nor the D7200 have an AA/OLPF.
And just to reiterate, I was able to get clean, sharp shots out of my D750 but not regularly; it was baffling, really... I was keeping my shutter speed up, really watching my technique, using quiet shutter mode, etc. but it just didn't seem like I was getting the sharpness I thought I should be with anything resembling regularity. In short, my shots lookrd an awful lot like the ones in this thread to and to my eye, these shots look soft. It wasn't until after I removed the filter that I saw my D750 shine like I thought it ought to be. That's just my assessment of course, my camera and my expectations; all very subjective stuff. Hopefully Don can find a solution that works for him that doesn't require "surgery".
For instance... I'm curious how shots taken with, say, a Nikon 85mm f/1.8G, stopped down to f/4 or so would look, assuming a low ISO, proper shutter speed, etc.