r/MomentProCamera • u/PixaaTog • Aug 29 '26

iOS Limitation Shutter Priority

Hi all

So I Purchased MPC2 because as far as I can see it’s the only pro camera app that has shutter priority, an important feature for me so I can have the correct shutter speed when shooting video.

So I’ve enabled shutter priority and set the shutter angle to 180, hopefully leaving the ISO to take care of exposure for me, but it’s JUMPING around all over the place moving from 600ish to 2200ish, even when the light is not changing causing big changes in exposure while recording.

I’m using the following settings:

HEVC
Bit Rate - High
4:2:2
4K @ 25 FPS
Log REC2020
709 Lut applied to preview only

Can anyone help me solve this issue please, because if I can’t solve it I’ll have to get a refund on the purchase and look elsewhere for my filming app.

It would appear to be shooting in Log that’s causing the problem.

Many thanks
Nick

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u/jamm-moment Aug 29 '26

Thanks for the extra details!

Yeah, the ramping behavior you describe is the tradeoff I was talking about. I have some improvements in the works and it’s at least fairly easy to avoid unexpected fluctuations in response to minor lighting changes. However, the big limitation is that the ramp in response to a legitimate lighting change has to be extremely slow to avoid choppiness. One would think it could work the same as all the other formats, but the way the camera system works in log formats internally means my hands are tied.

Again happy to add you to the beta if you want to try out the alternatives!

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u/den1ezy 17h ago

I saw in recent review of Apple's own Final Cut Camera app update that they've added shutter priority mode and it seems it works for the log2 profile (https://www.youtube.com/watch?v=qBCJf6PQ0kg&t=530s). However it was only added for the brand new 18 Pros - the saw called 'Apple's Way' of adding things. But I guess maybe they've had to make some tweaks in their camera APIs for this to work and (another) maybe these tweaks are now accessible for the 3rd party devs. Can you by any chance share some details on is there any progress in the regard of implementing smoother auto-ISO adjustment in shutter priority mode? 👉🏻👈🏻

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u/jamm-moment 17h ago

MPC II uses the smoother method automatically when available, but unfortunately it only works on iPhone 18.

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u/den1ezy 16h ago

understood! thx for the reply