12 inch Dallmeyer Dallon F7.7 Tele-Anastigmatic

[Nitish Kanabar]

Does someone have an information/opinion about this lens - 12 inch Dallmeyer Dallon F7.7 Tele-Anastigmatic? I could not find too much information about it.

Thanks in advance.

--NK.

[Ernest Purdum]

I don't know anything about it from personal experience, but the "Lens Collectors' Vade Mecum" lists it as Series XVI, covering 4" X 5", on sale starting about 1920. There was a very large family of "Dallon" lenses in many apertures, numerous focal lengths, and made for use with many formats. In 1933 there was a Series XVI of 60" focal length! Some Dallons were still being made after WWII and so werre coated.

[David A. Goldfarb]

Neblette writes that the Dallon, designed around 1914, was "the first well-corrected telephoto [...] from the calculations of L. B. Booth."

[Ernest Purdum]

I found a catalogue entry from about 1922? It doesn't help much. The 12" was NO.2, and the distance from the back cell to the groundglass at infinity is 6".