The power of regulating
the time of exposure is convenient for shortening long exposures in
dark interiors, or for lengthening inconveniently short exposures in
a bright light.
In practice it will be best to become familiar with the use of about
three stops, say the full aperture (perhaps F/5.6 or F/8), F/16, and
F/32.
For judging long exposures, the use of an actinometer (issued in many
inexpensive forms) is helpful.
A telephoto attachment increases the photographer's power of
rendering distant details on a large scale. The results are greatly
superior to enlargements of a small plate. It is, however, useless in
a wind, unless the camera is specially supported, and is otherwise
rather tricky to use. The traveller is strongly advised to master its
management at home. It should be adjusted by the maker to the camera
for which it is intended.
Unless a photographer's dark room can be had the developing of the
bulk is best left until the return home, but tests should be made to
see that the exposures are correct. A piece of ruby fabric or ruby
paper tied over an electric light will give a safe light after dark,
and 'Scalol' or some such one-solution developer which requires
merely the addition of water, will give all that is needed for
developing.
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