Nah ... I remember the thread(s). There's a few here in the forum. Think Misha did one with his Wide angle lens last year. I'm tired, have been in the dark for a week and it's my Monday back at work, but isn't f/1.8 to f/2.8 only a 1-1/3 stop difference? I always have trouble calculating stops off odd numbers for some reason. shrug In the past, I've used Sigma lenses, but the more I've used the 10D the more I've gravitated to Canon lenses. First is the compatiablity. I would have a cow if in the future one of my lenses suddenly became incompatiable with my camera ( alot of Sigma and Tokina lens owners found that their older lenses don't work with newer EOS cameras and many of them can't be "re-chipped" to work right). I think the question really becomes, what can you live with?