(Credit: Josh Goldman/CNET) About 6.5 years ago, Olympus announced the E-Volt E-410, which at that point became the smallest dSLR ever. In the years since, I don't remember anybody attempting to match it for size. But given that it used a Four Thirds-size sensor -- smaller than the traditional APS-C size sensor that's used by consumer dSLRs -- that was pretty unsurprising. Now Canon's rolling out its EOS Rebel SL1, which manages to outdo the E-410 for lightness and compactness, at least in two dimensions (the E-410 was thinner), becoming the smallest dSLR available. Canon EOS Rebel SL1 photos Essentially a shrunken version of the T5i -- the "SL" stands for "super lightweight" -- there are a few notable differences between the SL1 and its big brother. For one, it incorporates an updated version of the company's hybrid CMOS, which Canon claims offers a larger area dedicated to the contrast AF system for better autofocus outside the