Leica Apo-Summicron-M 1:2/50mm ASPH
Number of lenses measured: 1
Outresolving our previous #1 normal prime, the Zeiss Apo Distagon T* 1.4/55 Otus, this extraordinary lens proves that great optical performance doesn't have to come at the cost of compactness. With just 8 elements in 5 groups, the Apo-Summicron is on par with the more than three times heavier and much more complex Otus; an accomplishment deserving of respect. Tiny compared to other top performance lenses, but a giant nonetheless.