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Ah, but of course.
I figured that since this is a pretty limiting thing, anyone doing timelapse with AETTR would bring it up.

Ah, it is the limitations of the FRSP.. What a shame.
Really strange how this was not brought up in any of the videos or tutorials I watched..!

Well, I have the ND filters to make it work, I only need this for subjects that doesn't move thankfully!

I'll change the title of the thread to Solved, so that it may solve headaches of other newbies..!

Thank you very much for the very quick help and finding what the issue was! I can finally use this camera for timelapses which I love to create!

I'm trying to use Auto ETTR together with the intervalometer.

I reinstalled 1.2.3 build earlier to check if that was it, but it's the same.
All settings default other than turning on the modules.

I turn on Auto ETTR:
Always On
Highlight Ignore to something low like 5%
Midtone/Shadow SNR limit to any EV value, right now at 2EV on both.
Link To Canon shutter On.

This works when I am in Liveview and I am getting proper results.
But when I start using it with the Intervalometer in the Shoot section, with Full-res DNG for silent shooting, the exposure is now overexposing greatly.
If I aim the camera to something dark that would justify the cameras auto EV setting, the exposure stays the same and the image turns out good.

ALO = auto exposure lock, correct? It's off.
HTP I'm unsure what it is.

https://i.imgur.com/hxmTypZ.jpg

So for this image you can see how Auto ETTR works on the bottom left, but then once I start Intervalometer, the two images on the right happens.

I can see now that the shutter is actually moving. It's telling me 1/5th in the liveview dng preview, but the screen above shows different shutterspeeds like it should.
But I also see how the EV is telling me the image is very underexposed. A shot into a bright part of the room maxes out the shutterspeed at 1/8000, yet the EV compensates.

I've looked at tutorials and played around with the settings, yet nothing gives me different results when doing intervalometer.

My AETTR and Auto Exposure seems to work fine when it is used with single shots. But as soon as I start using the intervalometer, the exposure goes entirely wrong. It overexposes to the point where it's just a white image.

It seems the shutterspeed is stuck at 1/5th. I have it set to Manual mode because I need it set to that for the full res dng. The settings for the shutterspeed doesn't seem to matter, be it set manually via the Canon settings inside Intervalometer menu or with it off.
I can set it to anything and it's still stuck for Intervalometer only.
Doesn't matter if I use a fully manual(no electronic contacts) or a fully electronic lens.

ISO set to 100. But first shot with AETTR sets it to max ISO until I manually change it and it stays that way for the next shots. At least according to the info. Is perhaps the ISO bugged, showing 100 but actually maxing out after it calculates the exposure?
Doesn't matter if I have dual ISO on or off.

5D3, 1.2.3, nightly build.

Here's a better one!

Got that gimbal and this is all proper anamorphic.

I ran into the problem with flickering when using this build, anamorphic 1:3 binning, 14bit, dual iso, v1.2.3. If I have understood this correctly, it's the dual iso that's the culprit.
ONLY happened when I recorded clouds. Several recordings between are all normal.

https://streamable.com/8vp8z4

I'm unsure if this is the correct thread to report this. Saw that there was flickering reported for the eos-m version of this build, so I'm hoping I'm not mistaken.

When recording, in anamorphic(1x3), are you meant to only see the upper half of the cropped image?

I have Global Draw on in Liveview only, so hitting the halfshutter for preview also shows the upper half of the cropped image.
I believe that with one of the crop modes I was able to move the focus rectangle down so when I was preview/recording the image lined up to the actual footage.

If this isn't meant to be, I can provide material to show what I mean and troubleshoot.

Other than that, I've had no issues with this build. Incredibly impressed!

Some shots from Sweden!

Had a day off to record a few clips during the trip celebrating midsummer.

Absolutely love high dynamic range so magic lantern has really impressed me. Still a beginner but I think I have the basics right..!
Struggling with composition though, since you only see the cropped upper half of the image once recording, dual iso line doesn't help either 😅
But having tons of fun with this so I think it's worth investing in a gimbal for stabilization, since I love shots out of the car.

For video, with dual ISO, am I correct with understanding that the exposure you're seeing on the screen is showing the full dynamic range set by the two iso values? You're seeing both values at the same time?
So the exposure meters such as the histogram etc are metering correctly? I can expose normally?
Then when put into MLV, the exposure is set to the lowest ISO value you have chosen, but the data for the higher dual iso is still there in the data for you to recover in post process?

I am also running Dannes experimental build for the 5diii, using the 1:3 binning anamorphic preset. I noticed that the vertical lines are visible in the higher dual iso value areas in the image. So the darker parts that has been brightened up in PP have these lines.
This is normal due to the nature of noise and the binning, correct?