dun worree i dunno all that much either.. but when u get the cam
u will SURELY find out ahaha..
dttl is nikon's ttl system for it's digital cameras. ttl stands for
"thru the lens" where the exposure for the flash is measured.
original ttl readings on film bodies took light readings off the
film itself, and cuts flash power when optimum power is reached.
for digital, there's no negative to read light off, so i guess they
have some sensor inside to read the light.
for ittl, the body will send a pre flash just milliseconds b4 the
main flash to get a feel of the overall exposure for flash needed,
so the main flash can be fired at a power that's suitable. this is
supposed to be more accurate. however using slow or rear sync modes
(the flash fires just b4 the shutter closes, not when the shutter
opens) u can sometimes see two flashes, esp for very long
exposures. if u use wireless off camera flashes, this could be
disastrous, becos the pre flash will trigger the slave
flashes....
