The main problem with Reflex cameras is when you need a wide-angle lens because the lenses less than about 45mm focal length require a retrofocus design.This is a second set of elements whose only purpose is to move the lens away from the sensor and therefore allowing for space for the mirror operation. It makes the lenses bigger, more expensive and with bigger distortion.
Well, this camera has a 1.6 crop factor, therefore a prime lens of 50mm will be a half-tele (80mm equivalent).
If you want to buy lenses with wider than that, there are a few lenses designed to the EF-S standard, that takes advantage of the small size of the mirror of this camera (small mirror because the sensor is small) and it brings the lens closer to the sensor, using an optimized design. These lenses do not fit the full frame cameras, that have a bigger mirror.
For lenses with bigger focus distance this isn't usually an issue, so it doesn't matter. But try to find what Canon offers on choices of normal or wide-angle lenses designed to the EF-S standard, there are very few options and none of them is a prime lens non-zoom normal or wide angle lens.
Options are mainly:
EF-S 10-22mm 3.5-4.5 USM, Ø77 (16-35mm equiv) for US$720,
EF-S 17-85mm 4-5.6 IS USM, Ø67 (27-136mm equivalent USM) for US$510, this is an upgrade to the original lens that is not a bad one, by the way.
EF-S 17-55 2.8 IS USM, Ø77 for US$1.000,
So for wide angle options there a few remaining and no prime lens designed to the EF-S standard. It seems to be cheaper to purchase a Sony Alpha Nex or a Four Thirds Micro camera if you need good wide angle lens for a reasonable price. A mirrorless camera with the lens may be better and cheaper than just a wide-angle lens for Canon.
In theory, Canon could design lenses to operate with the mirror locked up, just like a mirrorless camera but it seems they have never thought of that.
Review by Fabio Passeto
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