p.1 #1 · 100 macro f2.8 L is usm intermittent focus on 7D
Recently I noticed my macro autofocus seemed to be inconsistent when set to full.
I don't use the lens for long work on a regular basis and don't recall problems before upgrading the 7D software.
Contacts are clean, focus works on macro, when focused on Full it is spot on accurate... it just hunts and doesn't always find the focus (especially if there is a big range between targets)
Has anyone else seem this problem?
Full disclosure: the lens did hit the floor once after rolling off my couch while changing out a different lens.
Thanks.
p.1 #3 · 100 macro f2.8 L is usm intermittent focus on 7D
A lens that is dropped has a 90% probability of some internal damage. It will likely decenter some of the elements, and possibly crack or break the small nylon bushings that guide the focus helix.
Always send it to be checked out after dropping it, otherwise, it will finally fail just when you need it most.
p.1 #4 · 100 macro f2.8 L is usm intermittent focus on 7D
Thanks to both of you for your replies.
I have LensAlign data from when I purchased the unit. A day of fiddling about will verify the situation.
It may well be it has always been slow at focusing over distances or it could be hooped.
The lens is likely slated for a return trip to Canon Canada along with my 100-400 for precautionary service.
Servicing a lens from Yukon isn't quite the same as couriering it across the cityscape. Call it a commitment.
p.1 #5 · 100 macro f2.8 L is usm intermittent focus on 7D
scalesusa wrote:
A lens that is dropped has a 90% probability of some internal damage. It will likely decenter some of the elements, and possibly crack or break the small nylon bushings that guide the focus helix.
Always send it to be checked out after dropping it, otherwise, it will finally fail just when you need it most.
I'd say 90% is rather overplaying it. It's certainly possible, but many lenses hold up remarkably well, without a hint of image damage after a drop. But it does depends, of course.
For porro prism binoculars you are sadly closer to the mark, a great many of those do not handle drops well at all!!
