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Occasional Contributor
Posts: 5
Registered: ‎04-04-2017

Focus problem???

I have an EOS 5d Mark IV camera with a Tamron maco. It's been working great for the last year I've been using them. In the last 2 days, as I'm photo'g still shots, it acts like it's having trouble focusing. I get a "clunk" sound following by "chattering" with a AI servo flashing in the viewfinder. I've search the web for any hints, cleaned the lens connection, then reset everything back to default settings. It's still happening. Any thoughts?

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Esteemed Contributor
Posts: 3,407
Registered: ‎02-17-2016

Re: Focus problem???

Does it work with another lens?

Occasional Contributor
Posts: 5
Registered: ‎04-04-2017

Re: Focus problem???

Yes, it worked fine with another lens. This issue does not happen with every shot with the macro. I haven't figured out if there''s a pattern; it seems quite random.

VIP
Posts: 11,341
Registered: ‎12-07-2012

Re: Focus problem???

" I've ..., cleaned the lens connection, then reset everything back to default settings"

 

Yeah, neither of those two things will help.  Cleaning the contacts is just a feel good I did something.  Actually you can do more damage to them than any benefit you get.  Since it is a Tamron resetting the camera probably won't help any more than just turning it off and back on.

If I were you, I would call Tamron.  It sounds like a total lens failure is in your future.  Canon can not help you with this and would instruct you to stop using the Tamron, so call Tamron.

EOS 1DX and 1D Mk IV and several lenses!
Honored Contributor
Posts: 5,824
Registered: ‎11-13-2012

Re: Focus problem???

Quite possibly a failure, but 1. does it do it in Single Shot, 2. when in AI Servo are you at a distance where it should focus (i.e. not to close?). AI Servo never locks focus like Single Shot; it keeps actively calculating on the subject.

 

Does the lens has image stabilizer or vibration control feature? If so, switch it off (if its on).

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Occasional Contributor
Posts: 5
Registered: ‎04-04-2017

Re: Focus problem???

Yes, it does it in Single Shot. I turned off VC and it stopped. Sounds like it could be a VC issue with the lens. I appreciate your help in ID'g this problem. Looks like the next step is to contact Tamron.

VIP
Posts: 11,341
Registered: ‎12-07-2012

Re: Focus problem???

"Looks like the next step is to contact Tamron.'

 

Now you'er talking!  Smiley Happy

EOS 1DX and 1D Mk IV and several lenses!
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