[elektro-etc] Cullmann DC32 vaku, SCA300

[Topybear]

"Canon’s wireless E-TTL system employs brief digitally-encoded pulses
of light (either visible or infrared, depending on the master unit
used) to transmit commands from a master flash unit to a slave unit or
multiple slaves. Since the system relies on special digital messages
built into the light pulses it’s immune to the problem that regular
optical slave flash units have - that of being triggered accidentally
in response to other flash units firing. (unless you’re near other
photographers who are also using Canon wireless flash units, of
course)

Wireless E-TTL doesn’t use radio signals like many third party
systems, so you can’t trigger flashes remotely from great distances,
such as the other side of a sports arena. And infrared signals are
thwarted by walls and tables and other barriers. But it’s ideal for
quick, portable and flexible flash setups in smaller spaces. Canon
chose light-controlled wireless rather than radio partly because it’s
cheaper to implement and partly to avoid the regulatory nuisance of
getting licensing approval for radio transmitters from every country
in which Canon sell photographic gear.

Canon’s wireless system requires at least two wireless-capable flash
units in order to work. A master flash unit is attached to the
camera’s hot shoe (either directly or using the Off-Camera Shoe Cord)
and the slave flash unit or units are set up to illuminate the scene
as desired. At time of writing, only one EOS camera – the EOS 7D – can
use its built-in flash unit to control slave E-TTL units. All previous
EOS bodies with built-in flash require an external wireless E-TTL
master device. "

http://photonotes.org/articles/eos-flash/index3.html#wireless

Teljes egészében: http://photonotes.org/articles/eos-flash/

Topy


gyapo <gyapo at freemail.hu> írta (2014. június 17. 15:49):
>> Hopp, most olvasom az EOS wireless beállítást,
>> fel kel nyitni a beépített vakut! Lehet a
>> beépített vaki "morzézi" le a "wireless command"-ot
>> exponálás előtt?
>> Ezt máshol is írták(hogy kell a beépített vaku).
>
> Nem a villanás hosszával vezérli a külső vakut, és közben méri a
> beérkező fényt?
>
> Üdv.: gyapo
>