One of the finest portrait lenses ever produced at any price — Canon's EF 85mm f/1.8 USM has been a professional staple for over three decades. On APS-C Canon DSLRs like the 90D it delivers a tight 136mm equivalent field of view ideal for close-up portraits and detail shots; on full-frame bodies the classic 85mm compression is perfect for flattering subject rendition. Ring USM autofocus is fast, near-silent, and fully manual-override capable at any time.
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No significant limitations identified — this is a versatile camera without obvious weak spots for most shooters.