Cutting right to the chase, the Z400f4.5 / Z1.4x creating a 560f6.3 is a spectacularly sharp combo! And to answer a couple who asked, yes, it’s a whole lot sharper than the old 400f5.6 / TC-14 combo I so loved. And to answer a couple of others, yes, the Z400f4.5 / Z1.4x is producing the same spectacular results as the 180-400 with its 1.4x engaged. I am still working on my Field Report video of the Z400f4.5 but wanted to answer this incredibly common question of late. “Sly” has been incredibly cooperative and in this rare moment when he’s not ambushing another hummer, you can count the barbs on his primaries and secondaries with all the information the Z400f4.5 / Z1.4x deliver. There is a very good reason why both are hard to find right now, demand is vastly out stripping delivery. I’m not the only one enjoying these gorgeous results. Because oh yeah, it’s very sharp!