Suppose you order a new digital SLR camera. Let's just take a Canon 10D as an example, since it is current. The package is opened and you take out the pieces, the body, the lens, the manual, the battery, etc.
First, you probably sit down in a good chair and read the manual, cover to cover. Somewhere in the beginning of that, you will get the battery plugged into the charger and let it go while you read the rest of the manual.
Sometime that first day, you will be ready to take some test shots. Once done, you will have to fool around with new software to get that all going on the computer. You transfer image files to the computer, and after a while you can see your tests on the screen.
Suppose you see (what you think is) a generalized focus problem. You go re-read the parts of the manual that seem to apply, just to make sure that you didn't skip something important about focus. Let's further the example by searching on the web and finding some focus test procedures. If you go through those fully, either you will find a problem or else you won't. If you do find a problem, then do you immediately jump to the conclusion that it is a defective camera? (I sure as hell don't.)
There are at least three or four different technical malfunctions of the whole system that could account for that. There are about a dozen user errors that could account for that, including misunderstanding something stated in somebody's focus test procedure. A new camera can be mishandled getting from the factory to the user. A few dangerous camera vendors will re-pack a previously sold problem camera to make it look like it is brand new. There's all kinds of *stuff* out there.
If the problem camera had one of the early serial numbers from the first couple of months of production, then that leads us to one clue. But then you would send that to Canon for adjustment as a warranty repair, wouldn't you?
Instead, it seems like some folks just fire a few shots across the bow and then leave. They don't offer any proof to substantiate their claims. They don't offer any details.
Oh, well. That just doesn't seem productive to me.
---Bob Gross---

