U.M. 1

20
INTERCHANGEABLE LENSES
The Honeywell Pentax offers many
interchangeable lenses in a wide var-
iety of focal lengths, all of which are
highly respected by both professional
and
amateur photographers for their
fine resolution_
The photographic
coverage of the various
Takumar
lenses is illustrated on page 21. With
focal length longer
than 55mm, the
subject image is seen through the
viewfinder larger than its life size_
FIXED FOCUSING SETTING
Because of the considerable depth
of field of wide-angle lenses, you
can use them as fixed focus lens if
the diaphragm and distance scales
are set properly_ For your con-
venience, the Super-Takumar lenses
shown on page
22 have a fixed fo-
Regardless of the lens selected for
your Honeywell Pentax, there
is
never need for an accessory view-
finder, ordinarily required for range-
finder type
cameras _
When interchanging lenses, hold the
lens by
the distance scale ring_ When
attaching a lens, filter, or lenshood,
do not screw it too tightly, as you
may find it difficult to remove.
cus mark.
Just align with the in-
dex the orange-colored figures of
the diaphragm and distance scales,
and the lens will be in fixed focus
from foreground to infinity.
You ' ll
find this extremely convenient for
fast shooting.
RESOLVING POWER OF TAKUMAR LENSES
Resolving power of all Takumar
lenses is factory-tested by skilled op-
tical engineers. There are three types
of tests: microscopic aerial test, pro-
jection test and photographed film
test. Resolving power of a lens shown
by lpm (lines per mm) varies depend-
ing upon
the method of resolution
test.
Takumar lenses have been tested
for resolving power to conform to
Asahi Optical Company standards
which are higher
than those set by
]IS (Japan Industrial Standards). All
Takumar lenses bear the seal of the
Japan Camera Inspection Institute
which insures the highest standards
of performance.
When testing your lens perform-
ance .
..
Use a slow-speed fine grain film.
Generally, high speed films are grainy
and are not suitable for resolution
test. Support your camera on a good
tripod. Use a
shutter release cable
to prevent camera movement_
The
definition of the picture on the nega-
tive film may decrease if exposure
and developing time are not proper.
Time your exposure and develop-
ment correctly.
If you do your own developing and
enlarging, see
that your enlarger uses
a fine quality enlarger lens.
If it is
not of a fine quality, your pictures
can never be sharp no
matter what
superb lenses
are mounted on your
camera. Usually,
the diaphragm of
the enlarger should be closed down
to
f/ 8 or fi lL