Love my 17-35 2.8. Its heavy but not all that big so it balances out nicely on a D810 frame. At 17mm expect distortion so you need to learn to use that to your advantage. I find it sharp throughout its entire range. I bought mine used through National Camera. It developed a noise in the motor in less than two weeks so I brought it back to National Camera. They honored their warrantee and sent it in to Nikon. They replaced the motor. Repairs were paid by National Camera. National Camera is a great company to buy from.