Ok here's a bit of a more varied ISO noise vs detail loss example on the 40D to to squash any debating!
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Just to double check, the 40D and 30D use the same battery grip right?
I don't want to buy yet another grip..![]()
Well the BG-E2 will work with your new 40D (I am using mine) however the BG-E2 is now phased out with the BG-E2n which is slightly larger with the new AF-ON button. The current one you have will work just fine.
Infact you'll be pleased to know that the BG-E2 fits more flush with the 40D which is a nice surprise making the body feel more solid.
Sorry to rain on your parade but that's completely wrong. The BG-E2n is identical to the BG-E2 except it has limited sealing around the battery door. That's it, a tiny foam strip.
Canon released with the 40D a wireless transmitter/portrait grip (It takes one BP511 which powers the transmitter) with an AF-ON button and much better build quality and fit. I don't remember the exact name of it but it costs about £500.