Autotype Company, author · London : The Autotype Company Ltd., Autotype Works, West Ealing · leaf 5
Changing the filter on the front of the lens can be facilitated by the use of a filter attachment such as that illustrated below. … When lenses of short focal length are used to produce small negatives, say 35 mm. or 6 cm., requiring a high degree of positive enlargement, then it is most desirable that the filters should be of high quality. Filters bound between thin glasses can cause serious distortion if used under the above…
Autotype process printing · Photography -- Printing processes
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
