One of the sentinels of Barton Springs.
I'd read a lot since 2010 about the Sony sensor that found its way into the Nikon D7000, the Pentax K5s and various other cameras that shifted the way we thought about high ISO performance and dynamic range. I'd made a mental note to try another used one if it became available for and advantageous price. I found my next one for under $500 in very, very nice condition with about 14,000 cycles on the shutter.
The first thing I did was test the focus accuracy by shooting various Nikon lenses nearly wide open (which, coincidentally) is the way I like to shoot most of the time. I'm not really an "f8" kind of guy.
The camera absolutely nailed focus with everything and I was happy. But I wanted to see what kind of operational differences there were between the 7000 and the 7100 so I took the older body out for a walk around the lake.
Most of the buttons are in the same place and the finder is very, very similar. As Ken Rockwell would say (paraphrasing) "One shows information in green the other in white. That and the different density sensors are the only real differences." I think I have to agree with him except for one thing. At the sizes I use the files the older camera has a greater impression of sharpness in the files.
But none of this has anything to do with the core message of this post and that is that cameras need to get, for want of a better phrase, zero'd in. I find nearly every body I shoot with has tiny differences to identical models. Little things like the way the shutters sound or the way the shutter button feels. When you accept a new camera you need to "wear it" for a while and shoot it until it becomes second nature. Only then are you ready to take it out and shoot commercially with it. If you don't shoot for money then the goal is to feel comfortable enough to use it for a "once in a lifetime" experience.
It may sound funny but the previous (defective) D7000 felt off. That's one of the reasons I checked it right away. The new one felt almost immediately comfortable. Again. It's just a hand, brain, feel kind of thing and not a series of magic metrics that I can measure on an instrument here in the studio. But it seems as obvious to me as f11.
Into the Nikon bag this one goes. Ready to leap out and soldier on should the D7100 falter or fall.
Interestingly, of the four EM-5s I have from three different sources, all with lower shutter counts, each one feels a bit different in action from the others...shutters sounds, hand feel and even the finders. I guess even in this age of ultimate automation there's still enough variance to notice.