I think my 50mm f/2 H is going to give the 85mm f/1.8 H a run for its money in IR sharpness.
I bought a nice 50mm for about $30 a while back and cut the aperture ring to allow mounting on my D610. It worked fine for the D610 but it needed a little bit more metal removal in order to mount the D80. I never got round to doing the mod. My newly converted D7100 doesn't have that issue so I tried out the 50mm H and WOW - sharp as a tack.
I am not one for false colour IR but was playing around with this image I took at 7 o'clock this morning. The leaf definition is wonderful.
