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EOS R6 Mark II Live view/Exp. Sim exposure changes when autofocusing, even in manual.

Chisato
Contributor

I just bought myself a brand new Canon EOS R6 Mark II with the RF 24-105 f4-7.1 kit lens. It's been absolutely phenomenal. However, I have been experiencing a little idiosyncrasy with the EVF/LCD Exp. Sim.

Essentially, when half-pressing the shutter button to meter and lock AF in One-Shot AF, the screen will occasionally become brighter. I have read reports of something similar like occurring on various other forums. However, in those aforementioned instances, it seems like the increased brightness is only temporary to help the AF find its mark before the Exp. Sim returns to normal.

In my case, the increased brightness is constant until the shutter button is released or a picture is taken. This does not affect the final picture (as it does not reflect the increased brightness), and it makes it very hard to accurately judge the exposure before taking the picture. Even the histogram is affected, sliding slightly over to the right.

This occurs in pretty much all shooting modes including Manual. The firmware has been updated to 1.5.0. I suspect it's the exposure being temporarily adjusted to assist the autofocus but not returning to an accurate live view after. I just want to know if this is an issue that warrants fixing, if it's a common thing among Canon cameras/lenses (or maybe just this particular lens), or if it's a setting that's causing this to happen.

I managed to make a video of the increase in exposure when holding down the shutter button halfway and releasing multiple times to better illustrate what's going on. The camera is currently in Manual Mode (without Auto ISO) with Single Point AF and Evaluative Metering.

If not the AF, could something else be causing it? I don't think it's an issue with the metering either, as the metering shouldn't affect the exposure in Manual. Any and all help would be appreciated!

10 REPLIES 10


@stevet1 wrote:

I thought I had read one time that your camera uses the widest aperture it can for the focal length you have set. to aid in focusing, but your picture is actually taken with the aperture you have set.


That's true, Steve, but in my case (I'm not sure about the OP), my aperture is almost always wide open because of the low light I am sometimes forced to shoot in. In some of those low light situations, like under trees, in thick brush, and late evening, my MILC's will sometimes brighten, like the aperture has opened to focus (even though it's already wide open) but it never returns to the correct exposure simulation once I lock focus/metering. I use the RF 100-500 which at 500mm is f/7.1, so it's a dark lens to start with. As mentioned, it's not a common occurrence, but it happens enough 🙂

Newton

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