[Tom]

Hi Dani!

APEX values

The three lines starting with EV display the exposure values in APEX units (Additive System of Photographic Exposure). APEX is a convenient unit for expressing exposure (Ev). The basic rule for calculating the exposure in every camera is Ev = Av + Tv = Bv + Sv. When the shot is exposed properly then Av+Tv is equal to Bv+Sv.
Ev – exposure value
Av – aperture value, calculated from the selected aperture; Av = 2 * log2(Fnumber)
Tv – time value, calculated shutter speed; Tv = - log2(shutter speed)
Bv – brightness value, measured by exposimeter; Bv = log2(brightness in foot lambert)
Sv – speed value, calculated from film sensitivity; Sv = log2(0.32*ISO)

The first line shows the exposure value of the shot calculated from aperture and shutter speed taking into account the optional exposure compensation set on the camera. The second line shows the exposure value calculated from ISO value and the brightness of the scene as measured by camera. The third line shows the difference of these two.

If the picture is exposed properly then the difference will be very small. But if you were shooting in M mode then this difference could be larger, and you could use it as a guide for adjusting the Exposure slider. Note: When shooting with a flash there is always a difference because the brightness of the scene is measured before the flash fires.

Quelle: http://www.dalibor.cz/minolta/plugin_user_guide.htm

Gruß
Tom