580EXII
The 580EXII, as a replacement to the 580EX, offers 20% faster recycling time than the previous one 580EX amd 580EXII replaces the old screw mount system with a lever latch that locks to the camera hot shoe much easier and faster. The Canon 580EX II also has improved weather and dust resistance.
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580EXII
The Canon 580EX II operates on four AA batteries; lithium AAs are recommended for better performance. Load the batteries according to the specifications, and slide the flash on the hot shoe of the camera and throw the lever latch to the right to lock the flash to the camera. Turn on the power to the Canon 580EX II flash, and wait for the pilot light to cycle to red to indicate it is ready for use. Push the pilot light in to fire a test flash.
The Canon 580EX II has an ETTL mode compatible with all shooting modes on the camera. To use ETTL, press the mode button on the flash until ETTL is displayed on the flash. Turn the mode dial of the camera to "Auto" or "Program," then depress the shutter halfway to focus. Make sure that the flash icon is lit up in the camera display, then take the picture. If a correct flash exposure was obtained, the flash exposure confirmation light below the pilot light will light for three seconds.
When shooting Canon 580EX II in the manual exposure modes (aperture, shutter and manual on the camera), ETTL functionality will work with the settings the photographer choose. In shutter priority, the photographer chooses shutter speed and the camera will set the aperture for a standard exposure. In aperture priority, the photographer chooses the aperture to control depth of field. If the background is dark, the flash will give standard exposure for the main subject and the camera will choose a slow shutter speed to get an even exposure in the background, so a tripod should be used. In manual mode, the photographer sets both aperture and shutter, and the flash will give standard exposure for the main subject while the shutter controls the background. If the aperture display blinks in shutter mode or the shutter display blinks in aperture mode, the scene is either under- or over-exposed and settings need to be changed.
Canon 580EX II
External flashes such as the 580EXII Flash are one of the most popular accessories among Digital SLR (and film SLR for that matter) owners. Why? Why use an external flash? The answer may be obvious to owners of camera bodies without a built-in flash, but not so clear to those using bodies with a built-in flash. The built-in flash is great for fill flash to light the shaded areas (such as people's 
eyes) in a pictures. To use fill flash, set your exposure for the ambient light, then dial in -1 to -2 EV FEC (Flash Exposure Compensation). The built-in flash is also useful for adding catchlights (sparkle) in a subject's eyes.
The next most-obvious answer is to raise the flash high enough from the camera that the lens and lens hood do not block the light - creating shot-ruining dark half moons in pictures.
Because the light source is very small and is located very close to the imaging axis, using the built-in flash as a main light often results in a harshly-lit picture (often with red-eyed subjects). Items close to the flash are often overexposed, the background often becomes black, harsh shadows typically abound and subjects tend to become flat looking. I use direct-flash-as-main-light (typically in "M" mode) only as a last resort, much preferring to use a higher ISO, wider aperture, slower shutter speed, image stabilization, tripod ... But, sometimes there is no choice - it is simply too dark, the subjects are in action ... In this case, you simply must use the flash for the main light. But, this does not mean the flash must be fired directly toward the subject.
The better grade accessory flashes feature tilt and swivel heads which allows them to redirect the light toward a larger white (or other similarly-neutral-colored) reflective surface such as a ceiling, wall, piece of white foamcore, commercial reflector ... Thus, the main light becomes the wide reflecting surface and the broad light source creates a much softer, less flat and far more pleasing image. The swivel and tilt features allow the 580EXII Flash to be aimed as desired.
In addition, a huge range of flash modifiers can be used with accessory flashes to create a broader lighting surface for direct flash, bounce flash or a combination of both.
Getting the flash out of the camera hot shoe is a great step toward better flash pictures. Using an E-TTL compatible Canon Off Camera Shoe Cord OC-E3, mount the 580EXII on a flash bracket. This allows specific placement of the flash in relation to the camera. Keeping the flash mounted higher above the lens to send the subject's shadow lower - where it is not as unpleasant. A bracket is also useful for macro photography.
The wireless remote capability of Canon's Speedlite flashes (discussed above) offer even far greater advantages. An accessory flash can be mounted in a softbox or umbrella for superb lighting. Multiple wireless remote flashes can be setup for a highly portable, complete professional lighting setup. Visit the links at the end of this review for more ideas and information on off-camera flash use.
An additional significant reason to use an external flash over a built-in flash is the amount of lighting output the external flash can provide. For example, the EOS Rebel XT/350D DSLR's built-in flash effective range (Guide Number) is 42' (13m) vs. up to 190' (58 m)(ISO 100 at 105mm) for the Canon 580EX II Speedlite Flash (same as the 580EX). Wider lenses will have a shorter effective distance, for example ... The Canon EF 50mm f/1.4 USM Lens has a range of approximately 98.4' (30m) with the Canon 580EX II.
Once you know why you need an accessory flash, the decision becomes "Which one?" The Canon options in my opinion are the Canon Speedlite 430EX Flash or Canon Speedlite 580EXII Flash (or possibly a used 580EX). Canon makes a Speedlite 220EX, but it is rather featureless - good mostly for fill flash.
Where to Buy Canon 580EX II
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