A more rare encountered focal lenght, 40mm seems to combine (at least for me) the 50mm and the 35mm lenses in one.

The Voigtländer’s Nokton f:1,4 is the fastest 40mm lens in production today.

Voigtlander 40mm F1.4 Nokton

Here are some words, reviews about this small, affordable but powerfull photographic tool for mirrorless cameras :

JRphotography

Ken Rockwell

CameraQuest

WMphotography

PhotographsByPeter

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