Editorial Review:Product Description:The Speedlite 420EX is sure to appeal to EOS users everywhere with its combination of power, features and affordability. It is fully E-TTL-compatible, and reverts to standard TTL operation when used on older EOS bodies or the T90. The fully swiveling bounce head zooms automatically over a range of 24mm-105mm. Most impressively, 420EX' wireless E-TTL compatibility permits it to function as a 'slave' unit, triggered by a 550EX; ST-E2, or MR-14EX. Any number of 420EX and 550EX Speedlites can be combined as 'slave' units.
Amazon.com Product Description:Though TTL compatible with all Canon EOS cameras and the manual-focus T90 SLR, the Canon Speedlite 420EX flash is also E-TTL compatible with all A-type bodies: EOS-1v, EOS-3, Elan 7 / 7E, Elan II/IIE, Rebel 2000, Rebel G, and EOS IX and IX Lite. The E-TTL function gives you features like high-speed FP sync mode and FE lock (spot/partial flash metering). The swivel head of the 420EX lets you bounce the light off the surrounding surfaces, giving your images soft, professional-quality lighting.
This flash also works as a wireless 'slave' flash with EOS-1v, EOS-3, Elan 7 / 7E, and D30 bodies. The remote flash firing is controlled entirely by a master unit--such as the Speedlite Transmitter ST-E2, Speedlite 550EX, or Macro Ring Lite MR-14EX--connected to the camera, making it fast and simple to set up. When used with the EOS-1V, EOS-3, or EOS D30 cameras, additional features such as lighting ratio control and modeling flash are also supported by the 420EX.
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Customer Reviews
Average Rating:
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Canon 480 EX Flash
Excellent performance and value for the money. The Canon 580 EX is best, but for my purposes this unit is just fine.
Rating: 
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Canon Speedlite 420EX Flash for Canon EOS SLR Cameras
Nice intermediate level flash, works great within its perameters.
Rating: -
so much better than built-in flash
I'm an amateur photographer, with mediocre skills. This flash makes all my photos look better vs the built-in, with little to no intervention on my part.
I use it with a Digital Rebel. I like that the flash varies in intensity, depending on ambient. Time between flashes is reasonably quick (particularly when ambient doesn't require a full flash). To avoid washed out faces, I'd always gotten accustomed to bouncing the flash off walls/ceiling (on my old camera setup). I've learned that I don't need to do that with the 420EX, and almost always keep it directly pointed at subjects (unless I'm trying to purposely create shadows across people's faces).
I also seem to get much less redeye vs built in.
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GREAT High-speed flash!
Hi have a Rebel Extreme, and needed to use the high-speed mode... but the flash couldn't even vaguely keep up. I was taking pictures of dancers, so needed a flash system that could keep up. The Speedlite really does this perfectly - I'm able to take a rapid-fire sequence of photos, and this flash system is there each time. I don't know if it really helps when taking a single photo, but if you want a flash that can keep up, this one is great! I like it so much, I'm planning on buying one or two more for my next shoot, to run in slave mode with this one.
Rating: 
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disappointing power
I bought this flash hoping to improve my indoor pictures with my Rebel XT. Amazingly, I find absolutely no difference between using the built in flash of the camera or this unit. I find pictures taken at a very reasonable distance (8-10 feet) to be under-exposed unless I correct the exposure using the menu. Would be curious if the more expensive units including the 430EX are better, but I cannot recommend this one.
