If you have a 580EX II, 430EX II or a 270EX and a compatible camera, you can use your camera’s LCD to control your Speedlite. For many functions, especially setting Custom Functions, the details provided on the camera LCD are very helpful. For the 270EX, it’s the ONLY way to control the settings. {What? You [...]

The only way to adjust the settings on a 270EX is to do it through the LCD of a compatible camera.
If you have a 580EX II, 430EX II or a 270EX and a compatible camera, you can use your camera’s LCD to control your Speedlite. For many functions, especially setting Custom Functions, the details provided on the camera LCD are very helpful. For the 270EX, it’s the ONLY way to control the settings. {What? You didn’t know that the 270EX has settings like manual power and 2nd-curtain sync? It does!}
Here’s a list of Canon cameras that have the ability to display current-model Speedlite controls via their LCDs:
EOS-1D Mark IV
EOS-1D/1Ds Mark III
EOS 5D Mark II
EOS 7D
EOS 50D/40D
EOS Rebel T2i/T1i/XSi/XS
PowerShot G11/G10/G9
PowerShot SX 1 IS/SX 10 IS/SX 20 IS
[Thanks to Chuck Westfall for providing the list!]

Left: Details provided by the 580EX II via the LCD on my 5D Mark II. Right: The same custom function menu as displayed on the LCD of the Speedlite.
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