![]() It balances quite well on my 30D but you may want to look at the Canon 35mm f/2 for your Digital Rebel if you're looking to keep the size and balance in check and can dispense with the extra stop. Size wise, the Sigma is twice that of the Canon 35mm f/2 and around 35% lighter and smaller than the Canon 35mm f/1.4. ![]() However, at a third of the price of its 'L' counterpart who cares 85mm f/1.8) and certainly a long way from the professional 'L' series construction of the 35mm f/1.4. However, it abrades very easily as I discovered on my Sigma 50-500mm and I would put the external finish of these lenses as not quite as good as some of the better Canon Consumer lenses (i.e. The EX finish is reminiscent of a soft, fine spray on finish that wears off if you even look at it-just kidding. I wish I could subscribe to that point of view. Some reviews have waxed lyrical about Sigma's EX crinkly finish. More importantly, it's very forgiving of distracting specular highlights which is not surprising when you consider that it has 8 aperture blades. The bokeh of the Sigma AF 30mm f/1.4 at wider apertures and close range is nothing short of sublime. So, unless I was going to be photographing flat-field subjects at close range then I couldn't see any practical optical advantage to purchasing the Canon 35mm f/1.4 L over Sigma's 30mm f/1.4 unless perhaps I was going to do a lot of low-light flat-field work in museums and alike. Specifically, I find that subject matter that is composed and focused at the borders of the frame even wide-open contains ample detail. However, I'm inclined to believe that Sigma's MTF50 border performance at wide apertures is more to do with field curvature issues than poor edge resolution. I ask this, because much has been made of the Sigma 30's mediocre border performance below f/8. So, how much of a difference are we talking about for all practical purposes? ![]() Border performance on the other hand sees Canon 35mm f/1.4 equaling it's f/2 cousin's center performance at f/2 with better border performance at f/1.4 than the other lenses obtain at the borders throughout their entire aperture range. MTF Tests at Photozone place its center performance on a par with Canon's 35mm f/1.4 with Canon's 35mm f/2 catching-up with both the Sigma and Canon 1.4's by middle aperture. Plainly put, the center performance of the Sigma 30mm f/1.4 is spectacular. The sharpest lens that I have ever used was my Carl Zeiss 45mm f/2 Planar-until now. After using it for two months I felt ready to talk about my experiences with it. Having been impressed with the general consensus with regards to the Sigma 30mm f/1.4's performance I decided to purchase this lens in August 2006 as my primary walk-around lens for my new Canon EOS 30D. Until early 2005 a fast normal prime lens for an APS-C class DSLR meant either a 35mm f/2 or going into hock for a 35mm f/1.4.
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