Title and statement of responsibility area
General material designation
Other title information
Title statements of responsibility
- Attributions and conjectures: Series title based on style of content.
Level of description
Edition statement of responsibility
Class of material specific details area
Statement of scale (cartographic)
Statement of projection (cartographic)
Statement of coordinates (cartographic)
Statement of scale (architectural)
Issuing jurisdiction and denomination (philatelic)
Dates of creation area
[between 1937 and 1976] (Manufacturing)
Physical description area
Publisher's series area
Title proper of publisher's series
Parallel titles of publisher's series
Other title information of publisher's series
Statement of responsibility relating to publisher's series
Numbering within publisher's series
Note on publisher's series
Archival description area
Scope and content
Series contains cameras designed with two identical lenses, mounted one above the other, for composition and the other for exposure. The twin-lens design allows the photographer a continuous view of the subject while photographing, as the 45 degree angled mirror is mounted to the viewing lens only and therefore does not have to list out of the way during exposure, as in single lens reflex designs. Most designs used a waist level viewfinder with a ground glass.
To browse the individual items in this series, click on the "View the list" link under the "File and item records are available for this series" title (to the right of the page).
Immediate source of acquisition
Items in this series were donated to the Ryerson University Library and Archives Special Collections department from several different sources:
Cameras from the PPCM collection donated by the Ryerson Image Arts Department in 2013.
Cameras from the Wilhelm E. Nassau collection donated by Wilfrid Laurier University in 2011.
Cameras from the Lorne Shields collection donated by Mr. Shields in 2008.