I've decided to avoid non full frame bodies and wait until full\nframe gets to my price range, so am getting a Canon 300X with a\n28-90. Now, I shoot mainly wide angle landscape, so Sigma 15-30\nis on the cards. Sigma seem to say its fine for film and digital\nand users seem happy. But what about the 12-24? Sigma seem a\nlittle more reticent about it as a film lens, I get the feeling\nits really meant for use of the centre only on a "1.6" body?