I've recently purchased a flash for my camera, and I'm buggered if I can figure out how it works. Hence I was hoping for some help from cic. Bear with me if they are newby questions. I have tried experimenting a bit but I'm still not sur e if I'm right. Simple questions first, then I deal with the more complex ones.
- a simple question - I assume my flash only fires at one speed and the only variable is the amount of light, is this right? The reason I ask this is because I looked at the strobist.com site and it was speaking about iso, aperture, speed and other factors. This confused me a bit.
- also, if I am in aperture mode, and ettl on the flash, when I get the meter reading I assume this has computed the flashes effect on this. For example, if I am reading 1/100th, then I assume this has already accounted for the effect of the flash?
- first if I deal with ettl in aperture modes.. Say I am in aperture priority mode and have the flash set to ettl. I assume the camera looks at the exposure, calculates how much light the flash needs to add, then adds it. Ok, simple so far (I think).
- now if I switch my camera over to manual mode with ettl, does the flash then automatically compensate for my camera setting? For example,if my camera shows an underexposed scene, then does the flash then try to add in enough light to expose the scene correctly? Likewise, if my manual settings overexposed, then I assume e flash goes on minimum setting.
- so now if I take my flash off camera and set to ettl, does it compensate in the same way as if it was on camera? I.e. does it assume that my flash is the same distance from the camera and hence require the same amount of light to get the right exposure? Following on from this question, if my flash is closer to the subject and ettl, I should then reduce the compensation on the flash to reduce the amount of light?
thanks in advance...