Command to make the camera meter & determine shutter/aperture?

[Marsu42]

I'd like to grab the current aperture value (Tv mode) or shutter value (Av mode) or iso (M with AutoISO), but while focus stack is running the camera doesn't measure these values until the next pic is actually taken. How do I get them - simulate half-shutter press, and with what command?

Background: I'll fill my own feature request again :-> and am adding an auto-cancel if lighting changes too much while running the stack.

[a1ex]

Umm... this should do the trick: SW1(1,50); SW1(0,0);