L-mount is a mount, not a format. 82 of the lenses here cover full frame, so their crop factor is 1 and a 50mm is a 50mm. This site's other mounts are not: X-mount is 1.5× and equivalents come out longer, GF is 0.79× and they come out shorter.

But 8 of them are Sigma DC — Sigma's own designation for an APS-C image circle — and those do not cover full frame at all. On an APS-C L body they are 1.5×, so the 30mm F1.4 DC DN frames like a 45. They are marked in the table and filterable above; their second line shows a different number from the first, which none of the full-frame rows do.

Worth knowing if you came here hoping L-mount was full-frame-only: among current mounts, essentially none are. Every full-frame mirrorless mount has an APS-C line — Sony E, Canon RF-S, Nikon DX, and here. The two that escape it do so for opposite reasons: Canon EF physically blocks EF-S lenses from full-frame bodies with an interlock, and Leica M predates APS-C entirely, so every M lens covers 24×36. That last one is the M catalogue.

Sigma prints one booklet per optical design, not one per mount, and footnotes which mount the size-and-weight rows describe. On the 10 manuals read here that footnote names a different mount from the record it feeds: "Dimensions and weight include the SIGMA mount". Sigma's own site lists different weights per mount for several of these designs, so the number is real and belongs to a different lens. (Elsewhere in the same manual set the footnote reads "The figures are for Sony E-mount" — on X-mount lenses, which are not in this ledger. The problem is the practice, not one mount.)

Those figures are refused, and refusal is a third state: not the em dash of "nobody said", not a value. It shows in the table above as ⊘, on 20 fields across 10 lenses, with the maker's own footnote on hover. Printing the number would state another mount's figure as this one's; printing a bare dash would lose the reason.

Separately, on 26 rows the metric figures agree and the makers' own imperial conversions do not — Sigma printing φ87.8mm × 111.2mm / φ3.5in. × 4.4in. in one document and Ø 87.8 x 111.2 mm (Ø 3.5 x 4.5 in) in the other. Those are counted here rather than in the disagreement tally: it is a fact about a maker's arithmetic, not about the lens, and folding it in would dilute a real catch with rounding noise.