Eventually I am planning on buying an external flash - my new camera does really well in low light but I have conceded after research that there are times when a flash is needed, and other times where it is actually better when done right.
I have read a lot on TTL, flash comp, etc and it all makes sense. However everything I can find online has skipped a very basic step that I must be missing... How to expose the correct shutter for a chosen aperture? See below for an example of what I mean...
When not using a flash, in full manual on the camera, I select an aperture and ISO, and then an appropriate shutter based on the meter reading on my camera. (and then adjusting ISO and aperture if needed to get a decent shutter speed).
So when your using an external flash on the hot shoe, say the 580EXII (or any other for that matter), lets say its a dark room. You crank the ISO to 1600 (b/c your comfortable with the noise level that produces), you want to isolate your subject so you pick an aperture of f/2.8.... Okay now what? How do you pick a shutter speed, b/c the meter is reading the ambient light which of course is dark (and will ask for a longer shutter speed) and will not be correct when the shutter fires.
As basic as this question seems to me, the tutorials sort of gloss over this. Either I am missing something or making it more complicated than it is? How do you meter preflash?
Thanks in advance for your replies!
- Chris
I have read a lot on TTL, flash comp, etc and it all makes sense. However everything I can find online has skipped a very basic step that I must be missing... How to expose the correct shutter for a chosen aperture? See below for an example of what I mean...
When not using a flash, in full manual on the camera, I select an aperture and ISO, and then an appropriate shutter based on the meter reading on my camera. (and then adjusting ISO and aperture if needed to get a decent shutter speed).
So when your using an external flash on the hot shoe, say the 580EXII (or any other for that matter), lets say its a dark room. You crank the ISO to 1600 (b/c your comfortable with the noise level that produces), you want to isolate your subject so you pick an aperture of f/2.8.... Okay now what? How do you pick a shutter speed, b/c the meter is reading the ambient light which of course is dark (and will ask for a longer shutter speed) and will not be correct when the shutter fires.
As basic as this question seems to me, the tutorials sort of gloss over this. Either I am missing something or making it more complicated than it is? How do you meter preflash?
Thanks in advance for your replies!
- Chris