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New Contributor
Posts: 1
Registered: ‎09-09-2013

Canon 300 2.8 stops focusing

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?

VIP
Posts: 11,688
Registered: ‎12-07-2012

Re: Canon 300 2.8 stops focusing

Yes, send it to CPS.

EOS 1DX and 1D Mk IV and several lenses!
Posts: 108
Topics: 1
Kudos: 22
Solutions: 3
Registered: ‎10-17-2012

Re: Canon 300 2.8 stops focusing

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.

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Esteemed Contributor
Posts: 3,816
Registered: ‎06-11-2013

Re: Canon 300 2.8 stops focusing

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??

 

 

Tim Campbell
5D III, 5D IV, 60Da
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