In 1961, when the Canon 7 was introduced, its revolutionary new standard lens
was advertised as being four times brighter than the human eye. How such a thing
could be measured is somewhat questionable, but what is undoubtedly true is
that the lens was a lot bigger, and with a much wider aperture, than had hitherto
been seen on a 35mm camera.
This was the now legendary 50mm f/0.95, a bunch of optics that became known
as the Canon Dream Lens. It was a huge chunk of glass whose lens cap had a diameter
of 75mm and, at a time when most rangefinder camera standard lenses had filter
threads of perhaps 40-50mm, this one boasted a whopping 72mm.
Canon 7 with its Dream Lens.
The camera was the first from Canon with a built-in meter coupled to the shutter
control. The meter was a selenium type, whose larger than usual cell took up
the best part of half the width of the body. There was a 10-second delayed action
control and flash photography was covered by FP- and MX-type sockets.
Pressing a small stud on the back of the camera allowed the film speed, of between
6 and 400 ISO, to be set in a window contained in the shutter speed dial. As
the dial was then rotated to choose the required speed, so an aperture scale
in a window on the top plate moved in tandem. A needle in the window, powered
by the selenium cell, moved across the scale, and the indicated aperture was
set manually on the lens. There were two color-coded scales: orange for high-sensitivity
light values of 6-13, white for low-light values of 12-19. The meter's
sensitivity was changed by a tiny knob on the back of the body.
Looking through the viewfinder when the Dream Lens was fitted, photographers
found its huge diameter obscured a good part of the view in the bottom right-hand
corner. The obstruction also partially obscured the actual field of view, for
a 50mm focal length, shown by a parallax-corrected suspended frame.
One way around that problem was to fit a separate Canon 50mm viewfinder, which
incorporated a parallax adjustment, but that idea was hampered by the fact that
the camera had no accessory shoe. To get around that little difficulty photographers
had to buy the special Canon Accessory Coupler, which fit to the top plate and
added an accessory shoe to the camera.
The viewfinder cutoff was not apparent when using lenses other than the Dream
Lens. For these, viewfinder frames could be selected by turning a selector knob
in the top plate for 35mm or 85mm and 100mm, the last two appearing together.
neat, streamlined top plate of the Canon 7.
Depth of field from the Dream Lens at its larger apertures was obviously shallower
than usual. In fact, the scale around the lens had only one designation for
f/0.95, rather than the usual two on each side of the focus point, and when
using that aperture depth of field at 10 ft was no more than 2".