09-09-2013 08:23 PM
I have a used Canon 300 2.8 non is that I bought used. Tack sharp, great lens. But if you change from horizontal to vertical, it shuts off. in the repair shop now, they can't figure it out. any thoughts?
09-23-2013 12:52 PM
Sounds like it might be a fault with the AF/MF switch or the wiring so that it is switching without you moving the tab. Canon service would be your best bet.
09-23-2013 03:21 PM
Ouch... I happen to own one of these and can vouch for the fact that it is _not_ supposed to shut off AF when you rotate it.
If the shop can't figure it out... I'm wondering who you sent it to. Is this at a Canon repair facility??