October 02, 2014, 12:34:41 AM

Author Topic: 6D + SIGMA 24-105 f/4 Art = locks up  (Read 1038 times)

mgelain

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6D + SIGMA 24-105 f/4 Art = locks up
« on: January 09, 2014, 01:54:55 PM »
I recently bought a Canon 6D and a Sigma 24-105 f/4 Art. I noticed that, if the internal GPS is turned on, when the camera goes in sleep mode (after a couple of minutes the top panel turns off except the GPS icon) then the camera wakes up but the lens does not respond and the only way to return to work is to pull the battery off and on again.

I tied with other lenses (a canon 50 f/1.8 II and a canon 24-105 f/4 L) and all worked well.

I tried my sigma lens on another 6D (in a shop) and the bug came back.

I'm pretty convinced it's a problem of the lens.

Could someone repeat my experiment?

1. turn the internal GPS on;

2. take a couple of pictures to make sure everything works:

3. wait until the top lcd turns off (except the GPS icon);

4. try to take a picture.

Thanks,

Mirco

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6D + SIGMA 24-105 f/4 Art = locks up
« on: January 09, 2014, 01:54:55 PM »

tron

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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #1 on: January 11, 2014, 08:16:16 AM »
Compatibility (apart from IQ)  is the main reason I got rid some of my 3rd party lenses (a Sigma 14mm 2.8 and a 400mm 5.6 both bought in the 90s). It seems that this kind of problems will not cease to exist (at least 100%).

I would return the lens if possible.
« Last Edit: January 11, 2014, 08:19:39 AM by tron »

dgatwood

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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #2 on: January 12, 2014, 01:19:31 AM »
I recently bought a Canon 6D and a Sigma 24-105 f/4 Art. I noticed that, if the internal GPS is turned on, when the camera goes in sleep mode (after a couple of minutes the top panel turns off except the GPS icon) then the camera wakes up but the lens does not respond and the only way to return to work is to pull the battery off and on again.

The 6D is a popular enough and current enough model that I'd expect such an easily reproducible problem to have been caught before the lens shipped.  My guess is your copy of the lens is a dud, but they could just be really, really bad at testing their products, relying on the ability to flash them in the field later....

Does switching to a different lens and then switching back reset things?  Removing and reinstalling the lens?

mgelain

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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #3 on: January 13, 2014, 01:35:23 PM »
I tried with different canon lenses but the issue is present only with sigma 24-120.

Random Orbits

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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #4 on: January 13, 2014, 02:01:11 PM »
Perhaps it would be worth trying the same experiment with a Sigma 35 in a store to see if all Sigma lenses behave like this...

Either way, it looks like Sigma failed to reverse-engineer how the Canon firmware/software behaves exactly.  At least with Sigma, there is a chance that they'd release new firmware/software so that you can update it via the USB dock...

neuroanatomist

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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #5 on: January 13, 2014, 02:02:15 PM »
Could be due to a specific setting, like the Kenko 1.4x TC that locks up a 5DIII when AFMA is enabled, but is fine if AFMA is turned off.
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Re: 6D + SIGMA 24-105 f/4 Art = locks up
« Reply #5 on: January 13, 2014, 02:02:15 PM »