A Description of Canon Rangefinder 25mm Lenses 1956-1975
Canon's first ultra-wide angle lens: the Canon 35mm f3.5 of 1956
Development and Introduction of the Canon 35mm f3.5
In 1955 and 1956, Canon was working with new rare earth glasses for their rangefinder
lenses. At the end of 1956 - November - they introduced the Canon 35mm f3.5. This was
a lens of five elements in three groups.
As with all Canon products of that era, both the lens and the 25mm finder were packaged
in fitted leather cases.
Wide angle lenses for single-lens reflex cameras which most people see today are of a
retrofocus design. This allows the rear element of the lens to be far from the film surface,
giving room for the camera mirror to swing. In the 1950s, rangefinder cameras did not have
this need, and wide angle lenses were of a 'short-focus' design. 12. The
short focus design in the case of the Canon 25mm had a rear element which protruded
deeply into the camera body.
rear element of the Canon 25mm f3.5
Canon 25mm Accessory Viewfinder
With the introduction of the
Canon VT, an automatic linkage between the camera focus and the accessory
viewfinder was created, allowing the accessory viewfinder to correct, automatically,
for parallax as the camera was focused. The 25mm f3.5 introduced at this same time,
1956, featured an accessory finder which functioned in this automatic parallax
Canon 25mm finder with automatic parallax correction linkage.
Canon V-finders, such as this 25mm finder, had an automatic parallax correction linkage to a
number of Canon models:
- the Canon VT, VTD
- the Canon L1, L2, L3
- the Canon VL, VL-2
- the Canon VI-L, VI-T
- the Canon P
Canon Finder Automatic Parallax Linkage
The Canon cameras listed above had a new feature in the accessory shoe.
A pin in the center of the accessory shoe raised and lowered as the
rangefinder focus was changed. This pin linked to a series of new V-type Canon accessory
finders. The finders would rest on this pin in the accessory shoe and raise and lower,
as the pin in the accessory shoe raised and lowered, allowing the finders to automatically
automatically for parallax. This was an advanced feature unique to Canon.
the parallax adjustment pin located in the accessory shoe which links to the matching
pin in the bottom of the Canon V-type accessory finder
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