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Do not change your lens in a strong light. When changing your lens have the replacement lens at hand. Then
quickly change the lens in the shade ... or use your shadow as a shield from the direct light.
Distance Scale
The distance scale indicates the distance between the focused subject and the film.
It is not necessary to check
the scale for normal photography; however
'
it is necessary for infra-red photography, which is explained later on
and for determining depth-of-field.
Film Plane Mark
This line gives you the exact position of the film plane in your
camera
'
To focus on a subject without using the range - viewfinder,
a measurement between the subject and the film plane is taken,
then the distance index mark is set to the actual distance figure.
