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Message: <blockquote data-quote="FastGlass" data-source="post: 272555" data-attributes="member: 13822"><p>The on camera flash needs to see the flash it is setting off. It works by line of site. So if your 910 is in an umbrella next to or behind you and you take a shot. Chances are the 910 wont fire because it can't see the on camera flash to tell it to. Also in bright sun light this setup has the same limitations. The brighter the environment the less likely the 910 will see the on camera flash trigger. Radio triggers work by sending radio signals to your 910 and don't require line of site to work. You can have your flash stuck inside a cardboard box and it will fire. Plus radio triggers have more than 3-4 times the range. I use the Pocket wizard Mini and flex and their range is I think 1500 ft. Something the "commander, remote " mode couldn't begin to do.</p></blockquote><p></p>