On Thursday, October 31, 2002, at 11:46 AM, Chip Louie wrote:
The A-TTL pre-flash is red, not white, you can easily communicate thisThe near-infrared flash tube is fairly innocuous, yes. But the 430EZ uses a blinding white preflash from the main tube when the head is any position other than straight on. These superfluous flashes are distracting, and there are many occasions when it's not practical to inform your subjects of what the flashes are for. Studio situations, yes. Impromptu situations, often not. All these preflashes also interfere with optical slaves.
information with your all of your subjects before hand so they will know
what to expect.
On the Canon EZ series flash heads, A-TTL only works whenAgain, this is true for the 540EZ but not the 430EZ. The 430EZ stays in A-TTL mode, useless white preflash and all, when in Av and Tv modes. Only in M mode does the 430EZ switch to TTL, which makes the 430EZ considerably less useful than the 540EZ in my opinion.
the head is pointed directly at the subject. When you tilt the head up (for
those that have this feature), the flash system is automatically put into
TTL exposure mode.
I really feel that A-TTL offers nothing substantial over plain TTL. A-TTL adds a preflash used for approximating distance when used with an EOS 1 or 600 series camera. Other than that all it does is stop down the aperture somewhat when shooting in P mode.
- NK Guy
--
PhotoNotes.org - a free information resource for the Internet
photographic community, created and maintained by tela design.
http://photonotes.org/ * http://teladesign.com/
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
