Tendy Goldmember  More info | Mar 31, 2011 08:16 | #1 OK this is odd. I spied a used 420EX for £79 in a camera shop, gets set to buy it but get told it wont work with the 30D, manual flash only! I thought ALL EX series flashguns worked on ALL EOS cameras? If not why not? Same for my Canon off camera cord II-that wont work with the 30d either! What a carry on! 5D | 30D | Canon IXUS 265HS | Oppo Smartphone
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Mar 31, 2011 08:25 | #3 BrandonSi wrote in post #12130422  Well, it is over 10 years old, and pre-dates the 30D by at least 5 years.. There are plenty of other options for current flashes.  Hmm, yes! But the off camera cord too? 5D | 30D | Canon IXUS 265HS | Oppo Smartphone
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Kechar Goldmember  1,699 posts Likes: 3 Joined Mar 2011 Location: Atlanta, Georgia More info | Mar 31, 2011 08:27 | #5 I searched around a little and found the following... Hi, i've just upgrade from a 300D to a 30D. i also have a 420EX flash that work fine with my 300D. But when i use it with the 30D there is a lot of picture that are underexpose. It it because of the E-TTL / E-TTL II compatibility ?. Eric Labrecque The difference in exposure is TOTALLY a function of the difference in the camera flash metering system. The 300D is ETTL. ETTL will heavily bias exposure to the focus point. The 300D is ETTL-II. ETTL-II averages exposure across the entire frame, BUT will limit flash output to prevent overexposing any of the flash metering zones. The 420EX is 100% fully ETTL-II compatible. BUT, where as the 420EX will support all seven of the 300D AF points, the 420EX will not support the four "diagonal" focus points of the 20D/30D/5D. The 420EX doesn't support the four diagonal points if you manually select them. However, if you have the camera set to pick a focus point automatically, the AF assist beam may (depending on focal length and subject distance) still cover them. Not something you'd want to bet on, though. Hope this helps flickr
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