I believe I've posted these pictures somewhere in lowyat before (or maybe not) but here are some samples of the vignetting on a 1.3x crop body from the Sigma 30mm

at f5


wide open at f1.4


there was no lens correction on both photos, vignette shown as it is. I always shoot wide open so I believe that it's never an issue for my although it's an EF-S lens

cheers!

I for myself used to like vignetting but it gets on my nerve nowadays haha!

I'm a proud user of this flash
works like a charm, has Master trigger, fast recycle time and as great as the 580 EX.
plus it's more than half the price.

I checked the Remote Trigger which is selling at RM10 and it's a Meike Trigger not the Canon RC-5.

It will work with any EOS as long as there's a Remote indicator when you set to self-timer mode.

which I assume it would work will all the latest models. Again as long as there's a remote control indicator next the the self-timer thingie on ur LCD