Tu as raison, caulre, pour la lune. Je crois qu'en général, c'est une fonction utile en photo de nuit, où il y a souvent de forts contrastes.
Comme je disais, ça ne sert pas souvent, mais c'est encore une fonction utile!
Rien trouvé dans le Manuel. Par contre, en relisant Wrotniak (en anglais, malheureusement):
You may force the AE-metering spot to be attached to the AF spot. Both functions have to be explicitly in their respective single-spot modes; the spot-on-lock arrangement described above does not count.
This setting did not exist on the original E-M1. A related yet different one was present on the E-Series SLRs.
More exactly, it is not one but three separate, independent options; one for each of the three spot-metering modes. The factory default activates all three.
As I use spot metering only with AE lock, for me this setting is irrelevant. If you plan on using spot as an explicit metering mode, think twice before activating this feature.
et juste au_dessus:
E3.2. AEL Metering
AEL Metering [BF] [C]
This is used to switch to a particular metering pattern when the measurement is triggered by pressing the Lock button.
The choice is between center-weighted metering and three spot modes, including HI spot-highlight and SH spot-shadow. There is also an option called Auto, to keep whatever pattern was set, without switching.
Note that there is no explicit option to switch to ESP metering. I agree with that: locking a matrix reading does not make much sense. Still, if you've set the general-use pattern to ESP and the AEL one to Auto, then an ESP reading will be locked — smuggled-in, so to say.
Don't even try to find things like this in Olympus manuals. This is why writing this piece takes me forever.
Also, the option name Auto is misleading. It suggests that the camera makes some decision here, while really it doesn't. Something else, like No Change or As Set would be better.
Interestingly, Auto is the factory default here, and that, combined with the previous default (see above), establishes ESP as the AEL pattern — an option which is otherwise not available. What is going on here?
My own preference and recommendation is, by far, Spot metering.
Spot metering only makes sense with exposure lock, and the lock makes most sense with spot metering. Remember the spotmeters from yesteryear?
Réf.: http://www.wrotniak....sett.html#METAF
Un complément très utile au Manuel.
Comme je ne me sers jamais du bouton AEL/AFL, j'ai décidé de suivre ce conseil: ce bouton me permet de basculer du mode matriciel au mode spot, juste d'un mouvement du pouce.
Françoise [:biggrin:]