The lens receives a rating of 5 for the combination of very good optical properties and a very affordable price. I recommend it for everyone who is just starting to shoot with a DSLR and wants to try what his camera is capable of, to get an ultra-accessible and quite effective portrait lens for a crop or a standard lens for a full frame. Relative to the Canon 50 / 1.4, it is much weaker in design and autofocus performance. Regarding the Canon 40 / 2.8, it differs in a slightly weaker design, but on the crop it is a completely full-fledged porter (and 40 is an incomprehensible narrowish standard one). On a full frame, 40mm is closer to the human perception of perspective for my taste, but 50 allows you to play with bokeh, it is much softer.
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