I’ve recently purchased a 105 2.5. Shot some test images in manual on my D3300, and very excited about this lens. I noticed a weird behavior though. Wondering if it’s normal. Focused at infinity and aperture at 2.5, everything is normal. If I click over to 2.8 or above, the leaves enter the aperture, but just barely. Say I stopped down to f5.6. As I focus closer, the lens actually stops down to approx 5.6. If I stop down to 11or 16, the aperture does not shrink. Still approx 5.6. If at 4, it does not stop down past 4. Lens snaps down to whatever aperture is set when I expose. Aperture lever in rear of lens is smooth and quick. Does it make sense that the aperture varies with focus (smaller diameter as you focus closer)? Thank you all. P.S. This is not the macro 105 P.P.S I plan to use this lens on my N2000 and (eventually) an FE2.