|85mm at f8|
Using the AFS Fine Tune was quite straightforward, but didn't seem to fix my problem. Even at the fullest extent of the fine tune my image still seemed to be focussing in the wrong place. To check out the camera/lens combination seems to require a few days, so that can't happen for a wee while, and it would appear from the brief tests I've done that I should really check my other lenses as at least the 18-200mm is spot on.
Anyway, hoping I'd made a mistake and was imagining the problem, I went into the backyard to take some shots of the kowhai blossom. The first shot was taken at f8 with the 85mm lens. Camera and lens mounted on a tripod. This is pretty sharp, but at f8 I'd expect it to be! Also the leading flower, pretty well central to the image seems nicely focussed. Interestingly my attempts at manual focus didn't give as sharp a result as the autofocus attempts. This was the opposite to last night's ruler experiment shots. Not pleased with the busy background, I opened up the lens and tried again at f1.4.