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View Full Version : 70-200mm F/4 IS USM Owners - MF Issue?


darrenmars
25-09-2011, 4:26pm
Hey guys,

Just wondering if anyone else has noticed that when manually focussing their 70-200mm that it sometimes "slips"? ie you turn the focus ring and nothing happens? It tends to only happen if I turn the ring quickly, which is rare, but it's still annoying. Is it just my lens or is this part of the design? Everything else works great, just when I focus by man rather than by machine. I've also noticed that the AF seems slow, tho I don't really know for sure as my only reference point is my 17-40.
unistudent1962
26-09-2011, 8:04am
Not something I've ever experience with mine.
If it's under warranty get it checked.
sdenness
26-09-2011, 10:35am
Doesn't seem to happen with mine.

AF is reasonably fast, although if it hunts through the whole focal range it takes longer than I want. I normally set the focus delimiter.
darrenmars
26-09-2011, 11:15pm
Hmmm... Unfortunately it's secondhand. Others have said it seems faulty or worn so maybe I should go back to the seller.
MightyOz
27-09-2011, 10:46am
Yeah good idea, i've had mine for a awhile now and never noticed that happening.
gje38752
19-10-2011, 11:07pm
Have same lens, never a problem, both man or auto focus smooth and very quick.
Pine
20-10-2011, 7:10am
Nope mine's fine ;)
Regards