Solution for exposure lock on 5D MK II

[Canon88]

Hey guys, when shooting in the rapid burst 3.9fps on the Canon 5D Mark II, in AI Serve mode in aperture value (AV), for some reason the exposure remains locked. For example, if I begin shooting a stop motion multimedia piece at 3.9 fps in AI Servo in the shade, then move outside of the shade - my exposure remains as it was when I exposed for the subject IN the shade. Essentially once I've moved out from under the shade of the trees above, the resulting images are blown out (overexposed) because the camera didn't correct the exposure.

Shouldn't the 5D Mk II correct for exposure compensation when in rapid burst mode, regardless if it's in AI Servo mode or not? But, specifically I'm looking for a resolution when the camera IS in AI Servo, as per my circumstance described above.

Thanks in advance,
Stephen

[zeroendless]

I don't have a 5d mark II to confirm this but generally the operation are similar. I think there's an asterisk (*) button next to the AF-on where you can set it for AE lock or not? When it's pressed, exposure will be locked for burst or one shot mode, and there's setting option on CF to change the behavior too, i guess.

[ngoduyviet]

If it's similar to the 7D or 5D, you can switch the AE lock around. I use the * to focus, and the normal button to take a shot to lock in the exposure.

[Canon88]

Originally Posted by ngoduyviet

If it's similar to the 7D or 5D, you can switch the AE lock around. I use the * to focus, and the normal button to take a shot to lock in the exposure.

Hey guys, I appreciate the feedback. I use the AF-ON to focus as well, and I'm familiar with the " * " to lock in the exposure, however, I'm not looking to lock the exposure.

After doing another test from inside of the Best Buy store I work at, I took a 50D, set it to AI servo, the cameras fastest frame rate, center-weighted metering, AV mode, ISO 3200, w/ a 28-135mm f/3.5-5.6 IS USM lens, shooting at f/3.5.

The test involved using the AF-ON button to focus with the shutter button to fire, focusing on an associate who was indoors. The associate walked from inside to outside, all the while the 50D was shooting in its highest burst mode setting. HOWEVER, after looking at the EXIF data, the shutter speed didn't change. This must be the reason why images are resulting over exposed once we stepped outside the store, but why the camera is doing this, I have no idea.

[ngoduyviet]

What metering mode were you using?

Try this, turn it to spot, then spot meter the person's face, then have them walk from shade to sun and do a burst and see if there's a difference.

[Canon88]

Originally Posted by ngoduyviet

What metering mode were you using?

Try this, turn it to spot, then spot meter the person's face, then have them walk from shade to sun and do a burst and see if there's a difference.

This just in! Canon USA tech support says it can't be done! How about THEM apples? Thanks Canon.

Technician/support rep said that it's an issue relating to C.Fn. group IV, No's. 1 and 2. You might be able to back-focus by changing the camera's focusing button to AF ON in the back of the camera, but to meter you must use the camera's shutter button. So, fml.

If anyone knows a way around this, let me know.

Much love from Flower Mound,
Stephen

[Jim Victory]

The best bet for trying to accomplish what you want to do is by setting C.Fn IV-1 to 2. In theory the exposure is set at the time the shot is taken. Whether it will change for each consecutive shot in a burst is questionable.

[Dobick]

just a suggestion to see if it works (because I have never used it) have you tried setting the ISO to auto and seeing if that adjusts it lower when an over exposure situation occurs?