Jerevan, coverage is a sometime thing. To some extent it depends on what's expected of a lens. Here's a case in point:

Henri Gaud has posted a page from a 1912 Établissements Phillipe Tiranty catalogue -- -- listing f/14 and f/6.8 Lacour-Berthiot Périgraphes. It says that both are convertible, claims that the f/14s cover 115º and the f/6.8s cover 95º. f/14s were offered in focal lengths of 45, 60, 75, 90, 120, 135, 150, 200, 250, 300, 350, 400, 450, and 500 mm. Recommended formats at f/25 are consistently between 100º and 110º without movements.

The 1912 coverage estimates may be inflated. An undated SOM Berthiot catalog published between the wars (see ) says that f/14 Périgraphes cover 106°, illuminate 112°. I have a SOM Berthiot brochure from, probably, the late 1940s that claims 100° for the 90/14 Périgraphe VIa and doesn’t mention convertibility; in it SOM Berthiot’s convertible Dagor type is the Eurygraphe. Georges Laloire has sent me undated data from Berthiot, probably published between the wars, that also claims 100° for f/14 Périgraphes. As I said, coverage is a sometime thing.

Modern wide-angle lenses for large format have two very important advantages over the ancient anastigmats such as the W/A Aristostigmat and Cooke Ser. VIIb (4/4 double Gauss), Protar V (5/2) and Perigraphe VIb (6/2 Dagor clone). They're faster and have less fall-off of illumination off-axis.