Sony Mirrorless A6400 not accurately displaying live view

[MrCacahuate]

What is the issue?

• Live display doesn't accurately display actual output raw photo. It could be under or over-exposed.
• When focusing, sometimes you do get a glimpse of what your final image will be. (I believe this is because apparently on sony mirrorless, to aid the autofocus system, exposure is temporarely increased, this doesn't impact your actual exposure, its only temporary, therefore my theory is that what Im looking at, is my actual exposure + 1 stop maybe)
• The preview is shown as well-lit, however once you see the raw file it's way underexposed.
• After taking the picture, it somehow does increase the exposure and the output is more accurate to what is shown on live view, like if the camera took a screenshot or maybe the JPEG is wrongly labeled as .ARW, or somehow metada gets corrupted, since shows it was shot at the same settings, same ISO, same aperture, same exposure time but one picture is darker than the other.
• After taking the picture in this mode it loops back as taking the picture darker.

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Why I believe is an issue with the adapter?

• Changed the lens to the 50 mm f1.8 and same cycle repeats.
• Changed to the kit lens from sony and it work ok.

Any help or theories?

• I know the simplest way would be, just use another adapter or maybe buy a sony lens but, I mean... there are plenty of people with this adapter, so could be an issue with this particular unit of adapter? I haven't seen something similar to my case on the internet.

[Olaf W.]

2 hours ago, MrCacahuate said:

Any help or theories?

Yes. The display has its own settings and doesn’t necessarily show an accurate preview. You need to watch the exposure meter. 

[elijaht6]

Hi Found this in the manual and it worked for me. Its a setting that alters live view.

 

Live View Display

Sets whether or not to show images altered with effects of the exposure compensation, white balance, [Creative Style], or [Picture Effect] on the screen.

1. MENU → (Camera Settings2) → [Live View Display] → desired setting.

Menu item details

Setting Effect ON:

Displays Live View in conditions close to what your picture will look like as a result of applying all your settings. This setting is useful when you want to shoot pictures while checking the results of the shot on the Live View screen.

Setting Effect OFF:

Displays Live View without the effects of exposure compensation, white balance, [Creative Style], or [Picture Effect]. When this setting is used, you can easily check the image composition.
Live View is always displayed with the appropriate brightness even in [Manual Exposure] mode.
When [Setting Effect OFF] is selected, the  icon is displayed on the Live View screen.