Voigtländer NOKTON 40mm F1.2 Aspherical II is listed for Leica M with Full frame coverage. Its verified front filter size is Ø52 mm. The supplied research links this exact mount variant to manufacturer evidence. Body-specific AF, crop and adapter behavior remain separate checks.
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Verified specifications
| Field | Value |
|---|---|
| Maker model code | NOKTON 40mm F1.2 Aspherical II |
| Mount | Leica M |
| Image format | Full frame |
| Front filter thread | Ø52 mm |
| Model ID | voigtlander-nokton-40mm-f1-2-aspherical-ii-leica-m |
| Focal length | 40 mm |
| Maximum aperture | f/1.2 |
| Filter attachment type | screw_in |
| Weight | 9.4 oz (approx.; 267 g maker value) |
| Length | 1.76 in (approx.; 44.7 mm maker value) |
| Maximum barrel diameter | 61.8 mm |
| Closest focus | 1.64 ft (approx.; 0.5 m maker value) |
| Lens AF hardware | Maker states no |
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Compare the exact model code and rear mount in each listing. Amazon results may contain another mount or generation; the search is not a compatibility verdict.
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Search camera lenses on AmazonChoosing a camera
Look for the Leica M designation on the camera specification, then verify the exact model code and mount variant against its support page. The maker lists a 40 mm focal range and f/1.2 maximum aperture. A physical mount match is a starting point; still AF, movie AF, crop behavior, stabilization and firmware need separate checks.
Choosing a filter
A circular screw-in filter with a matching documented thread size is only a mechanical candidate. Magnetic filters, wide frames and stacked rings need separate system and vignetting checks. When no front thread is specified, do not buy a size from the focal length or barrel diameter.
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Official sources and scope
Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.