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scyrene said:neuroanatomist said:scyrene said:Oh right. Well, better in every way except it's a stop wider. It definitely beats the 24-105 at f/2.8!![]()
Not really, at least when comparing the 17-55/2.8 on APS-C with the 24-105/4 on FF. The former is equivalent to a 27-88mm f/4.5 focal length and DoF, and the 1.3-stop ISO advantage of FF more than counters the 1-stop wider aperture. So, all you really gain with the 17-55/2.8 is activation of the center f/2.8 high-precision AF point.
But compare the EF-S 10-22mm with the 17-40L, similar in price but the 10-22 is optically far better.
Argh! Well then I go back to price. APS-C (M4/3, etc) surely has *some* advantage, or else why bother?!
The main advantage is lower system cost, and sometimis size/weight. Provided you don't need shallow DoF and shoot in reasonably good light, a smaller sensor can be a good option.
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