ETTR: When "Expo Limits Reached", pls return settings.

[l_d_allan]

5d2 2013-Oct-1 Nightly Build

In dim lighting, using "Set" to get ETTR will sometimes fail with the message "Expo Limits Reached".

When that happens, the ISO has been changed to 1600, and the shutter speed to the lowest allowed (like 30 seconds). My preference would be to return the ISO and shutter speed to the previous settings.

My practice is to make my best guess at exposure, take a picture, and look at the ETTR hint based on the actual RAW histogram (which I believe doesn't use LiveView, but that actual RAW data).

I've noticed that I'll get this message when it isn't really that dim, and an EV higher than 1600 ISO and 32 seconds will work ok. I suppose this is because ETTR "Set" works with LiveView, which meters at about the equivalent of 1/30 second? Or not?

[a1ex]

Why not just setting the slowest shutter to a sane value that can be metered in LiveView? (e.g. 1 second)