Leica DG Summilux 12mm F1.4 ASPH.
Micro Four Thirds
Panasonic Leica DG Summilux 12mm F1.4 ASPH.

About

This is a small sensor Micro Four Thirds mount lens introduced by Panasonic 8 years ago. Its focal length is 24mm FFE with an aperture of ƒ/1.4. You can find reviews of it on DPReview and DxO.

Related

New
Used
Starting at $600
KEH is American and has slightly higher grading standards, while MPB is originally from the UK. Both are global leaders in used lens trading.

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24mm FFE ƒ/1.8