Canon A-1 - Manual (Page 50)

OPTIONAL VIEWING AIDS
Dioptric Adjustment Lenses S
The dioptric adjustment lens S is an acces-
sory which slides into the grooves of the
viewfinder eyepiece from above to correct
individual eyesight. With them, eyeglass
wearers can photograph without glasses.
The A-1's eyepiece has a standard dioptric
adjustment of -1 for normal eyesight.
The following 10 kinds of dioptric adjust-
ment lenses are optional accessories: +3,
+2, +1.5, +1, +0.5, 0, -0.5, -2, -3 and -4
(diopters). The specified diopters of these
lenses are recorded as the real power when
attached to the camera, reflecting the -1
power of the camera's viewfinder.
You could select the appropriate dioptric
lens by choosing the one closest to the num-
ber of diopters in your glasses prescription.
But, we propose that you actually look
through the viewfinder after placing the
dioptric lens over the eyepiece to be sure
you have the best one.
Angle Finders A2 and B
There are some types of photographic
subjects for which viewing them through the
eye-level viewfinder of the camera is un-
comfortable. This is particularly true in the
fields of copying, close-ups, photomacro-
graphy and photomicrography. Then it
might be more convenient to mount one of
these angle finders over the camera's eye-
piece. Both angle finders rotate 90° for
comfortable viewing from above or from the
side.
Angle Finder A2 gives a correct image
top-to-bottom but reversed left-to-right
while the more sophisticated Angle Finder B
gives a completely normal image. Both
show the entire field of view as well as
viewfinder information.
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