GF 50Sii exposure bracketing puzzling behavior

[AlecS]

Hello. When I bracket my exposure in a high contrast scene, I found a puzzling behavior and I am hoping you can help me understand why it is happening.

Typically, when I bracket a scene I start by taking a picture that protects the highlights from clipping and I do that by watching the Histogram and the highlight clipping indicator. Then I bracket a series of shots adding more exposure. Usually at most the biggest range was 8 times the exposure needed for the highlights. That is what I used to do with my XT3 before I started using the GF50siiI.

Since I started using the GF that calculation no longer works. For instance, in the 2 pictures I added below as an example I held the ISO at 100 and the Aperture say at F8, and changed the speed to take 1 picture to optimize the brightest highlight, and 1 picture to optimize the shadows. As you can see the difference in exposure between those 2 shots is huge. One shot was take at 1.3" and the other shot at 60". 

Is that normal for the GF camera? If it is normal, then I figured that what I need to do to bracket shots is to take a shot to optimize the highlights, another shot to optimize the darkest shadows, and then take maybe a couple of more shots in between.

What do you think?

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