This post was last modified: 2013-10-19, 00:28 by
Gunther.
Let us get this feature a bit more stable then I will make a tutorial. Currently it's work in progress!
Auto Holy Grail is totally different story from the EV-Auto. The former works quite well already and is the way to go, it uses histogram analysis to make the adjustments.
In brief:
Set the longest Shuttertime and highest ISO you want to reach. Shutter will be increased first, then ISO.
Shoot as usual and observe the histogram, but occasionally clicking on "Display next JPG". Once you have an "optimal" exposure, activate "Auto Holy Grail".
This will set the Reference value to 10% under the current "float AVG" level.
The float AVG will now decrease as it gets darker and once it trespasses the reference value, the adjustment will take place.
You can now leace this on auto until you eventually notice, that you have to go darker (or lighter) - in that case just change the reference value with the +/- buttons to change it.
That's basically it!