TRIFOCAL VIEWFINDER:
Some models of H cameras are supplied with a trifocal view-
finder (Fig. 6) permitting, like the Octameter Viewfinder, a strict
correction of the parallax.
The camera number is also stamped on the viewfinder, near
the eyepiece. This shows that the viewfinder has been
specially adjusted for the camera on which it is fitted.
Placing the viewfinder in position :
To place the viewfinder in position, make the red guide mark-
ings E coincide, and introduce feet of viewfinder into the
clamps of the lid. Push the viewfinder well home, and fasten
it by turning milled ring D in the direction of the arrow shown
in Fig. 6.
To remove viewfinder, repeat same operation in reverse.
Parallax corrector:
In this position there is no vertical parallax and the slight
lateral parallax will be corrected by displacing eyepiece F
of viewfinder by means of the knurled screw G. The scale
given above eyepiece F corresponds to the distances between
subject and lens. Always return the scale to oo after using
the camera.
Using the viewfinder with lenses of various focal lengths :
When levers H and J on the viewfinder are placed horizontally,
the viewfinder is ready for use with the standard focal length
lens supplied with the camera. This focal length is engraved
on the optical section K of the viewfinder. By raising or
lowering levers H and J the finder is adjusted for use with
one or other of the lenses of different focal length on the
turret. The corresponding focal length is engraved on the
lever.
The optical section K of the viewfinder is interchangeable.
It is composed of the lenses and the levers, so that when
a further set of lenses is bought a new set can also be bought
for the viewfinder to correspond with them. Certain com-
binations of widely varying focal lengths, however, are not
possible on the same finder.
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