Behalf Of Chris Eastwood wrote: I was just reading up on why I can't use my 430EZ with my 20D, and found something confusing about E-TTL instead.
from the page http://photonotes.org/articles/eos-flash/index2.html#recompose on EOS cameras and flash it says: If you're in the habit of using the old "focus, lock AE and recompose image" technique, be sure not do this when taking flash photos I'm a little confused by this, as when using flash in manual mode, its primarily the distance that is used for GN calculations. Assuming youre focusing on the main subject, then this distance information has always given me the basis for what I wanted in exposure. Measuring reflectance is problematic anyway, which is of course the reason for the existence of incident flash meters. ------------------------------------------------------------------------ ----------------------------------- They are talking about Type A cameras, which include yours among others such as EOS-1D, 1V, 3, D60, D30, 10D, etc., and these support FEL with newer "EX" flashes. Because you are using the 430EZ, the operation for flash follows the older methodology and that is AE Lock. The reason for this is that the 540EZ uses A-TTL and does not pre-flash. FEL uses pre-flash to flash meter the subject prior to exposure. You can ONLY do this with EX flashes on your 20D. This is why they say the ambient light metering is separate from flash metering. Hope this makes sense. Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
