Henry Low wrote:
Hi guys,
I just got a 420ez flash and i found out that it only does manual with my 20D cause they dont speak the same ETTL language
My question is, do u guys use alot of manual flash? I am no advance photographer myself, but I get the feeling t hat from alot of people that tehy use manual flash more so then auto flash. I guess that may also be the case for certain types of photography.
Shooting a flash in manual is more than just setting the camera to Manual and shooting away. You have to control the output from the flash by using the appropriate aperture. And that is determined by the distance the subject is from the flash. So, unless the flash has a little distance/aperture guide table pasted on the back of it, you're going to be doing a lot of calculations (in your head) to determine the aperture you need everytime you shoot a subject. Or, you can print up a table ahead of time so you won't have to worry about the math when you are shooting. 
Need a little more adventure? Try determining the aperture needed when you want to use the flash in bounce mode. 