tkbslc wrote in post #12557833
But your finger is already up there for the shutter button and your thumb is on the back for support. The on-body controls are already exactly where your hand is.
I don't know what lens you used, but it must have been short. Now imagine you are using a 200mm+ lens. You would be cradling it near the end of the lens, and how you would have to reach backward near the lens mount, messing up your grip, and then move the hand back to change aperture. Imagine if it was a zoom and you had to move between the zoom and aperture rings all the time.
The point is, I've used Nikkors for many years before I used Canon. I started shooting Canon DSLR in 1999 with the D2000, Nikon in 1975. I could instantly adjust back to the Nikon way without thinking.
With the Nikon way, a quick focus then move my thumb off the focus ring, together with my thumb and middle finger turn the aperture ring and then hit the focus ring again. One hand only adjusts the lens' controls. Left hand lens, right hand camera.
BTW, the lens I used this afternoon was a AI-S 50mm f/1.4. With a longer lens I would slid my hand down the length of the lens barrel to adjust the aperture, while still cradling the lens for support.