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Leica APO-Summicron-M 50mm f/2 ASPH vs Leica Summicron-M 50mm f/2

The Leica APO-Summicron-M 50mm f/2 ASPH and the Leica Summicron-M 50mm f/2 side by side, computed from this guide's catalogue.

Which to pick

On these specs they are close to even: hold both if you can, and let the price, the handling and the lenses you want decide.

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Leica APO-Summicron-M 50mm f/2 ASPH	Leica Summicron-M 50mm f/2
Maker	Leica	Leica
Focal length	50mm (prime)	50mm (prime)
Full-frame equivalent	50mm	50mm
Maximum aperture	f/2	f/2
Made for	Full frame	Full frame
Mounts	Leica M	Leica M
Stabilised	no	no
Autofocus	no, manual focus	no, manual focus
Cameras it fits	20 in this guide	20 in this guide

Leica APO-Summicron-M 50mm f/2 ASPH: 50mm.

Leica Summicron-M 50mm f/2: 50mm.

Leica APO-Summicron-M 50mm f/2 ASPH: f/2 wide open.

Leica Summicron-M 50mm f/2: f/2 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

How wide each sees, at each end, on the sensor it was made for.

20 cameras in this guide take both, so either works on the same body.