Originally posted by matiki Coincidentally, I just found a (negative) reviewers personal blog in which he took photos of a measuring tape so you could quantify the front focus. I'm henceforth ignoring his reviews.
I find this view somewhat astonishing.
One of the assumptions we implicitly make as we endeavour to improve our photographic skills is that faults in the photograph are due to shortcomings in our technique. If this were not true, striving for better pictures would be pointless.
Usually it's a safe assumption, since most cameras and lenses do not have manufacturing defects, and most of the time the cause of the flaw is rather obvious, and the technique correction not difficult to achieve with practice.
But occasionally, we find something in our photographs that causes doubt. Strange exposures that we can't explain, focusing that's a bit off - I'm sure we all encounter this from time to time. But if the problem recurs frequently there's a risk that our confidence in the equipment will be undermined.
This is the point at which some careful investigation is warranted, and 'careful' means under controlled, repeatable conditions - since in the field, it is usually impossible to check things reproducibly, and then you end up with pointless conjecture and argument.
Measurbation, as we love to ridicule it, has its place. It's not the sort of photography we want to have to do, but if you suspect that there's something wrong, what would you rather do - trust blindly that you don't have one of the duds that occasionally escapes the QC process, and continue producing sub-standard pictures, or know for sure?
Usually, of course, even after you've checked carefully, the conclusion is still that it's the technique that's at fault. Which is a good thing
But occasionally it's not. K10D stop-down-metering, anyone?