its not stupid because the reason to use AV with flash is that you want some environmental light in the shot and you want to be able to change how much the environmental light shows in comparison to flash light.. if you want to lower the light power from the flash, you put the exposure down from the flash. i kinda doubt that nikon works as you say because its totally ridiculous to anyone who knows anything about how to use flash. if it worked as you say i dont think anyone would use nikon on press photography that requires flash. i bet you are just confused something or had some dummy mode on without knowing it

This post was edited by Antichrist- on Mar 22 2011 08:27am

I shot aperture priority with flash 24/7 when i had nikon(i used to work in clubs and take pictures there).
It didn't work like this, i'm sure of it.

after googling like 30 sec i found out that you had slow sync off on your nikon and thats why it behaved like its in dummy mode(default setting in nikon)

This post was edited by Antichrist- on Mar 22 2011 08:34am

Can i do this on canon aswell?
I know i can do it manually, but can i shoot Av with the shutter speed regulation based on flash like in auto mode?

This post was edited by Verdena on Mar 22 2011 08:36am

yes, but why would you do that? if you use some auto mode with flash, you do it because you want to use the flash as fill light. slow sync off = that dummy mode you had on your nikon as default setting, slow sync on = flash works as a fill light and lets you control the environmental light from camera and flash power(or ETTL exposure) from flash seperately.

This post was edited by Antichrist- on Mar 22 2011 08:40am

Yeah the problem is that i can't control the power from flash when shooting Av man.(Unless i turn my flash to manual)
What i am trying to say since the very beginning of this discussion is: If Av exposes based on ambient light, why doesn't the flash add the correct amount of light missing to obtain a decent shutter speed?
The flash is powerful enough to give me fast shutter speeds without the need to bump my isos(thing that i would do if i only had the ambient light and not the flash light aswell).

yes you can control it, that wheel you got on it is to control the exposure compensation in ETTL mode, it works the same way as changing the exposure compensation on cameras AV mode, except that it only controls the flash naturally.
what i have been trying to tell you from the beginning of this discussion is that you do want to control the environmental light and the flash light separately if you care about the results at all..
if you want some point and shoot type of flash exposures(like you get with slow sync off and low iso and fast shutter on AV), just put the camera on manual mode, low iso, 1/250th shutter speed and aperture based on dof you are looking for and let the ETTL handle the flash exposure.

Open your mind to Canon's technology... With Canon , you can

Take a superior photo. IQ cannot be matched. Nikon should go back to making eye glasses.