As the first fix, on the crop, which makes it an excellent portrait lens (examples: page=0 and /554082? page=1) Has some pros: Price, true color reproduction, amazing detail and sharpness at smaller apertures, in general, in skillful hands, Has cons: If you get a Chinese assembly (I have one), then after a while backlashes will appear, or less, bright points (for example, foliage that reflects light) There is no built-in motor, so owners of new screwdriverless carcasses (D3100, d5100) you need to choose.
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