Sigma 30mm f/1.4 VS Canon 100mm f/2.8 -Right Edge Crops
A caution about the use of these results:
1.) If you compare the two lenses, you'll see that the Canon 100mm is much sharper through to the edges and corners than the 30mm. This isn't much of a surprise and does NOT say anything bad about the Sigma 30mm f/1.4. This dramatic difference is due to the focal length -it's much easier to get clear edges and corners with a longer focal length. My suspicion is that even the Canon 35mm f/1.4L lens isn't completely sharp in the corners either!
2.) These tests show black and white text to maximize the lack of sharpness. In the real world the difference in sharpness that you see here will almost be imperceptible. The differences will never be this clear in a real photo.
3.) This is a fast lens who's use at low-numbered apertures (which is kindof the point of having it) will yield a very shallow depth of field. When you have a shallow DOF, your subject is usually not right on the edge or in the very corner of the frame anyway, so edge and corner performance isn't really all that important on this type of lens.
4.) Keep in mind that none of these shots were sharpened at all, they are straight RAW files, converted to jpegs.
Don't fall into the trap of obsessing over numbers. I obviously have to an extent, but you have to be able to take a step back and see the whole picture. These tests may be flawed and the results may not apply in real world situations. Use at your own $risk$.
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