Canon F-1, Instruction Manual, Page: 13 / 83

5 FOCUSING
Turn the focusing ring of the lens as you look in the viewfinder until the main sub-
ject is sharp. The three focusing aids of the standard screen can be used alone or
in combination according to the subject and your own preference.
Note:
The New Canon F- 1’s focusing screen, which makes precise focusing possible, also
determines the metering sensitivity area. There are 13 types of focusing screens and
three different metering areas optionally available to suit your particular focusing
and metering requirements.
1. New Split Rangefinder
The new split-image rangefinder divides the subject in half horizontally and is es-
pecially useful for a subject which has vertical lines. The subject is in focus when
the two halves merge to become one unbroken image. When using a lens with a
maximum aperture of f/5.6 or smaller, one-half of the split-image rangefinder may
take on,a slight color.
2. Microprism Rangefinder
When the subject is out of focus, the microprism ring breaks the subject into tiny
fragments, causing a shimmering effect. It is clear and steady when your subject is
in focus.
3. Laser-matte Screen
The laser-matte screen appears fuzzy until the subject is -in focus. It is particularly
effective when you are using accessories for copying or close-ups.
Note:
Ten eyesight correction lenses from +3 to -4 diopters are available. They may make
viewing and focusing easier if you are near- or farsighted. Choose the one closest to
your eyeglass prescription, then make a practical test if possible.
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