I already owned a Canon 50mm f/1.8 for a while and now thinking to get another one. now i'm shooting with 50D.
so should i get the 20mm f/2.8 USM, 28mm f/1.8 USM or 35mm f/2?
what is USM again? i think it is some new tech that Canon created.
Best Answer
The 20 mm is the widest.
USM tells you that it uses a high speed auto-focus motor. USM has been around for almost two decades
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The EF20mm f/2.8 USM was released in June 1992
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