580EX II
The popular Speedlite 580EX Flash has been replaced by the new 580EX II Speedlite Flash, which 580EX II features a host of improvements, including a metal hot shoe withan improved locking mechanism for added durability, an external metering sensor for non-TTL automatic flash exposure control and a PC socket for use with non-dedicated slave triggers.
Canon 580EX II fully compatible with all EOS SLRs, the Speedlite Canon 580EX II is gasketed for dust and moisture resistance, making it possible for users of EOS-1 class digital SLRs and many L-series EF lenses to use flash safely when shooting in dusty or wet environments.
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580EX II
Canon’s latest high-end Speedlite Canon 580EX II has a couple of features long requested by serious amateurs and professionals. One of these is an external automatic flash exposure sensor, which provides the option of automatic flash – but not TTL (Through The Lens). Instead, the flash controls its output similar to older “thyristor” flash units many pros used in years past.
Far from being a throw-back to the good old days, this is a viable option for different types of shooting. One example Canon 580EX II 
is providing automatic exposure when a flash is positioned off-camera, especially if it’s triggered by a third-party radio or infrared remote system. Likewise, Canon 580EX II will provide automatic flash when triggered by conventional flash slave. Additionally, some users may find that Canon 580EX II provides less fussy and more consistent flash exposures for ordinary on-camera flash with indoor scenes where you aren’t trying to balance flash and ambient light.
Canon 580EX II Speedlite
The Canon Speedlite 580EX II can perform this with any EOS camera, film or digital. We’ll explain how to set the speedlite to this mode in a moment. With yesterday’s “thyristor” type auto flashes, the photographer would dial-in his or her ISO setting on the flash unit, and in some cases, would also choose one of a few available distance range settings (for instance, the popular Vivitar 283 flashes had a red color-coded range, good from about 3 to 30 feet for direct flash). A little scale told the photographer where to set the lens aperture when the flash was set to a particular distance range. The flash would vary its output by literally using its front-facing sensor to read reflected flash illumination as it returned from the subject. When the sensor “thought” enough light had returned, 580EX II instantly sent a stop signal to the flash. The result was brief flash durations when close to a subject, and longer, brighter durations when shooting something farther away.
This type of automatic flash has worked for many photographers for several decades. While there is no question a modern TTL flash and camera can combine to perform tasks simply not possible using an external flash sensor (like automatically balancing ambient and flash exposure), auto flash using an external sensor is a proven method of flash exposure control. The 580EX II now gives users this option.
Where to Buy Canon 580EX II
You can buy this Canon SpeedLite 580EX II Flash from many big retailers offline or online like Amazon, Best Buy, Target, Walmart etc. But which one is the best ? You can choose which one you like, we provide the Sellers List with Compare Price. These sellers all have a good reputation, also you can choose The Best Price which included FREE SHIPPING.