Z7 auto ISO seems seriously flawed

Started 4 months ago | Discussions thread
Slaginfected Contributing Member • Posts: 561
The black hole of possibilities

Peter v.d Werf wrote:

olyflyer wrote:

You have to adjust your camera for the changing conditions, don't ever expect ANY camera to have direct connection to your brains, that's not going to happen.

I could be wrong, but I don't think the OP is confused or doubting what exposure or modes to use or or expecting magic or brain connections (nice one though;-)).

His remark is that the camera offers certain minimum and maximum values which are not upheld as thresholds, but that apparantly by design (and documented in the manual) the shutter speed can still be lowered automatically while not increasing the iso and that (while in auto iso mode) the user has no control over which direction is chosen.
Yes, you can always go full/partial manual, S or whatever for specific situations, no problem, but that is not what the OP is refering to or asking. (at least not from how I read it)

Probably the only solution is to remove the max ISO cap.

It's a good start. There is no reason at all to keep the low maximum ISO, especially not in darkness. There is zero benefit in doing that, especially if you want to avoid motion blur.

A good start could be simply offering the user a choice to either lower the shutter speed or increase the iso beyond the set thresholds if the camera deems it's needed for the proper exposure. Some user prefer one, other the other. Then everyone is happy and the UI better matches the expectations.

The problem is, depending on circumstances this may end up as a black hole, so you have to draw a line somewhere.

So, for example, with A mode it means fixed aperture. You can decide to have an upper and lower limit both to ISO and exposure.

Now you have options what to do once you hit a limit, i.e. underexposure is about to happen:

  • You can ignore all that, stay within the limits, and you underexpose things.
  • You can start raising the ISO beyond the given limits.
  • You can increase the exposure time beyond the given limits (which is what is happening).
    • Question here is, if you do that, how far do you go? Follow the 1/focal-length rule? What with manual/adapted lenses and a defined focal length, follow it or not? Just go as far as needed, and for video not below the fps?

You could add even more things, like video resolution (lower resolution = potentially longer exposure), or whatever other quality defining metric ... and because of these endless possibilities someone says: We do it this way, we document how it works so people can read up about it, and done. That is maybe not always the best option (because in the end it is software only, right), but for the camera maker it doesn't make sense to invest tons of time to give you all kinds of (im-)possible options to do whatever. In theory you would offer some kind of programmable interface, but that has other implications, so this is normally not done, either.

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