Early Work In Photography
A Text-book For Beginners
Forfatter: W. Ethelbert Henry C. E., H. Snowden Ward
År: 1900
Forlag: Dawbarn and Ward, Limited
Sted: London
Udgave: 2
Sider: 103
UDK: IB 77.02/05 Hen
Illustrated with an actual negative and positive, and numerous
explanatory diagrams throughout the text
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How to Use the Outfit.
71
penetrate into the camera and fog the plate Within, The
lens must be uncovered for only two seconds, then the
cap must be firmly replaced, and the protecting sli {
of the plate holder again pushed in to cover the surface of
the plate. The plate holder may then be removed and taken
to the darkroom for the plate to be developed; or it may
be kept until all the plates are exposed. The plates may
be kept after exposure for almost any length of time
before development without deterioration. There is no
fixed limit; but in our own experience we have kept eX
nosed plates in all climates for six months, without ill effect.
P We intend to treat of the development of negatives in a
future chapter, devoted especially to the subject, in th
meantime we have to say a few words concerning some pro-
bable faults in adjusting the camera, and how such faults
may be recognised. T n we
In order to make these faults sufficiently conspicuous, we
must ask the student to set up his camera opposite a rather
high building, and focus it upon the ground glass screen.
For this purpose (as
we do not intend to
expose a plate) it
will be well to use
the lens at its full
opening—without
any stop —so that w
may have a brilli-
ant image to look at.
Now, in order to in-
Fig. 8.
Fig. 7-
clude the entire A
screen ft will be necessary to tilt the camera a little so that
Speiens is directed upwards, rather than exactly level
re This will naturally throw the focussing screen
(while it is clamped at right angles to the base board) out
of the truly upright position—as will be seen by the plumb
line shown in the sketch. The question is: how will this
affect the rape will carefully examine the ground glass he
If the student of the upright lines are truly perpen-
will find that none (owing to the rules of perspective)
dicular, all of them are (or of the building, which will be
converging toward the screen. The effect is shown in fig 8.
found atthconvergence may be eliminated by one sim-
Die movement:the levelling of the focussing screen, winch
is done by means of the swing back.