Finding the right balance is hard to do. Just ask a chef. Adding even one ounce of the wrong ingredient can cause a recipe to quickly go from a delicacy to a disaster. The same can be said of DSLR design. For years, manufacturers have been trying to strike the right balance between features, functionality and price. With a full-frame sensor, tiltable 3.2-inch screen, uncompressed HDMI output, 1080p resolution at 60 frames per second, manual audio controls and zebra bars all at a shade more than $2,000, the D750 may just be Nikon’s piece de resistance.