![]() ![]() Mounted on the subframe Canon 7D, performance for sharpness is very similar, perhaps a bit more forgiving at the ƒ/1.4 setting. This performance continues through to ƒ/8, and diffraction limiting begins to set in at ƒ/11, but you don't see the impact of this until ƒ/16, where a generalized softness begins to descend upon the image. Stopping down to just ƒ/2 everything gets a little sharper, but corner softness isn't really addressed you have to stop down to ƒ/2.8 for that, where the corners are tamed enough that the lens is offering practically tack-sharp performance from corner to corner. For isolating a subject this is actually quite good, but if you want corner to corner sharpness you will need to stop down significantly. Mounted on the full-frame Canon 1Ds mkIII, the lens produces images with a sharp center but significantly soft corners when used wide open at ƒ/1.4. The Sigma 35mm ƒ/1.4 DG HSM produces surprisingly sharp results, even when used at its wider apertures, though it must be stopped down slightly for maximal sharpness. ![]() ![]() The Sigma 35mm ƒ/1.4 DG HSM takes 67mm filters, ships with a petal-shaped lens hood and is available now for around $900. ![]()
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