Mill Hill was the pre WWI Zeiss Binocular and lens factory the company set up around 1913 which was transfered to Ross by the British Government during WWI. I saw a Tessar the other day in a Compur marked Ross, Mill Hill. There were other small WA lenses with big coverage I have a 141mm f16 Ross WA AM lens, Air Ministry - an unmarked Protar identical to the Ross Protars made before WWI which were f16 (and marked with the Zeiss Patent number) unlike the Zeiss version which was f18.
HUGO MEYER 40CM PROFESSIONAL
Hugo Meyer were selling the WA Aristostigmat as a professional lens. Hugo Meyer made some remarkable lenses in the 1920s & 30s, in another thread there was discussion of specially modified Speed Graphics to shoot boxing matches in the 30's but Meyer had a 6x4.5 reflex with an f1.5 plasmat lens by the mid 1920s, Ernemann had an f1.3. I discovered that my optical mouse sometimes jumps and I insert letters in the wrong place, alongside the small keyboards on laptops that cause occasional double letters like nbominal They're faster and have less fall-off of illumination off-axis. VIIb (4/4 double Gauss), Protar V (5/2) and Perigraphe VIb (6/2 Dagor clone). 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. Georges Laloire has sent me undated data from Berthiot, probably published between the wars, that also claims 100° for f/14 Périgraphes. 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.
An undated SOM Berthiot catalog published between the wars (see ) says that f/14 Périgraphes cover 106°, illuminate 112°. The 1912 coverage estimates may be inflated. Recommended formats at f/25 are consistently between 100º and 110º without movements. It says that both are convertible, claims that the f/14s cover 115º and the f/6.8s cover 95º. Henri Gaud has posted a page from a 1912 Établissements Phillipe Tiranty catalogue - listing f/14 and f/6.8 Lacour-Berthiot Périgraphes. To some extent it depends on what's expected of a lens.
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