Personally I'd say the most obvious gap is a wider prime, either something like a 30mm 1.4 ala Sigma or a 20-25mmish pancake to go with the SL-1/100D.
I have my doubts as to whether theres a market for a 50-150mm f/2.8, I think crop users tend to want the extra reach so will go for a FF 70-200mm f/2.8 instead, as I understand it going EF-S isn't going to effect the size/price of tele's much.
One zoom that I think might be interesting is something between your typical normal and UWA ranges. Tokina seem to be targeting this with there new 12-28mm, I think something like a 14-35mm could be very popular if the price wasn't too high.
I have my doubts as to whether theres a market for a 50-150mm f/2.8, I think crop users tend to want the extra reach so will go for a FF 70-200mm f/2.8 instead, as I understand it going EF-S isn't going to effect the size/price of tele's much.
One zoom that I think might be interesting is something between your typical normal and UWA ranges. Tokina seem to be targeting this with there new 12-28mm, I think something like a 14-35mm could be very popular if the price wasn't too high.
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