Q3 43: EVF dims upon shutter half press in AFc

[Dr. G]

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No matter what metering mode I'm using, the EVF is dimming and the histogram shifts downward upon half press of the shutter release with the camera in AFc.  I don't seem to have the problem in AFs.  It happens in both P-A-S and P-A-S-M exposure preview modes.  Do I have something set wrong in the camera?

 

When I review the image, it appears to be the same exposure as it was without the shutter half press.

Edited October 5, 2024 by Dr. G

[DDTHOMAS]

I found mine dimming only in low light situations. 

And in the Q3 43 manual, page 116, notes under Exposure Preview, it says "Depending on ambient lighting conditions, the brightness of the screen image may differ from that of the actual images, despite the settings described above. The screen image will appear considerably darker than the – correctly exposed – picture." 

[Dr. G]

It's just odd that the histogram shifts downward upon half press as well.

[SrMi]

3 hours ago, Dr. G said:

It's just odd that the histogram shifts downward upon half press as well.

The histogram corresponds to what you see in the EVF. If it gets darker, the histogram will show that. AF uses not only PDAF but also EVF stream to acquire focus. For some reason, and under certain situations, the brightness of the data shown in EVF has to be lowered to acquire focus (better contrast?).

[Dr. G]

Ah ok, that makes sense.  I'll just stick to making sure my exposure is properly set before getting focus lock.

[Le Chef]

The EVF is not an accurate measure of exposure, so use it to frame the shot not determine correct exposure.

If the metering changed as a consequence of half pressing the shutter you might have reason for concern, but it doesn’t.

 

Edited October 7, 2024 by Le Chef

[koehntopp]

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vor 4 Minuten schrieb Le Chef:

The EVF is not an accurate measure of exposure, so use it to frame the shot not determine correct exposure.

The Histogram is a much better and more accurate guide to exposure.

If the metering changed as a consequence of half pressing the shutter you might have reason for concern, but it doesn’t.

This is not about metering.

If you're on AF-C and are still focussing, you can't see your subject properly.

[Le Chef]

According to the OP it’s about metering: maybe you have a different problem.

[mrlouie]

On 10/4/2024 at 5:19 PM, Dr. G said:

No matter what metering mode I'm using, the EVF is dimming and the histogram shifts downward upon half press of the shutter release with the camera in AFc.  I don't seem to have the problem in AFs.  It happens in both P-A-S and P-A-S-M exposure preview modes.  Do I have something set wrong in the camera?

 

When I review the image, it appears to be the same exposure as it was without the shutter half press.

Happens in iAF also and Ive had it a few times in AFs in low light. 

[letoeb]

I did some research recently and in my experience it’s related to the iDR settings. If you turn iDR off, the images are consistent and don’t change in all modes. If iDR is on in AFs, it’s applied to the image in the viewfinder after the camera has acquired focus when half-pressed.

Since iDR is applied only to the JPEGs, the preview when half-pressed would show you what the final JPEGs would look like. And the preview before the half-press shows you how the RAW is actually exposed (with picture style added). iDR is controlling the dynamic range of the JPEGs, that’s why this „issue“ is more present in contrasty lighting situations.

If you don’t care about dynamic range optimized JPEGs, just turn iDR off and you’re good.

Edited October 20, 2024 by letoeb