Canon has recently unveiled two new entry-level flash: Speedlite 270EX II and
Speedlite 320EX
.
Both have a cool feature that goes by the name of Flash Release. In practice, thanks to a button on the side of the unit, as you can see on the cover, you can trigger your camera without cables or other accessories. The reflex
trip after 2 seconds. A delay that has been deliberately integrated within the system and you can not reduce or modify because, according to Canon it is a good compromise as he explains in his Digital Learning Center talking about this new feature.
facts are also examples where the use of flash that triggers the camera can take part in the lighting of the shot or only be used as a sort of remote control.
This feature is not compatible with all models, but only with those on the list below and are fitted with an infrared receiver: Canon EOS 5D Mark II
Canon 60D and 7D 
and 600D Canon 450D, 400D, 350D and 300D
Street maximum aperture of f/5.6 or faster, all AF points on these cameras should work as cross-type AF points, but this does not apply to the lenses listed below. These are rather old lenses - all of them were released between 1990 and 1995. objectives affected are:
EF 35-80mm f/4-5.6 EF 35-80mm f/4-5.6
- II EF 35-80mm f/4-5.6 III EF 35-80mm f/4-5.6
- USM EF 35-105mm f/4-5.6 EF 35-105mm f/4-5.6 USM EF 80-200mm f/4.5-5.6 II
- EF 80-200mm f / 4.5 to 5, 6 USM Source: Canon Italy
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