Bausch & Lomb 78-1600 User Manual
Discoverer
®
15-60x60 Zoom Spotting Scope
Welcome to a world of adventure with your new Bausch &
L o m b
L o m b
®
D i s c o v e r e r
®
Zoom Spotting Scope. The nature
student and sportsman who takes pride in optical quality can
make no better choice than the Discoverer Zoom 15x-60x
Spotting Scope. The Discoverer is one of the optically finest,
most versatile 60mm spotting scopes in the world. With the
D i s c o v e r e r, the user can scan an area with a wide, bright field
of view at 15 power and instantly zoom in for breathtaking 60
power close-up. The Zoom Power Control Ring smoothly
increases or decreases the magnification as desired. T h e
exterior body contains a unique rubberized surface providing
d u r a b i l i t y, noise reduction and a non-reflective surface. T h e
following directions should be followed closely to assure
sharp clear observations.
make no better choice than the Discoverer Zoom 15x-60x
Spotting Scope. The Discoverer is one of the optically finest,
most versatile 60mm spotting scopes in the world. With the
D i s c o v e r e r, the user can scan an area with a wide, bright field
of view at 15 power and instantly zoom in for breathtaking 60
power close-up. The Zoom Power Control Ring smoothly
increases or decreases the magnification as desired. T h e
exterior body contains a unique rubberized surface providing
d u r a b i l i t y, noise reduction and a non-reflective surface. T h e
following directions should be followed closely to assure
sharp clear observations.
M O U N T I N G
The Discoverer’s tripod mount provides a convenient means
of fastening to any standard photographic tripod, car window
mount or shooter’s stand. For best viewing results, mount
your Discoverer on a firm support to prevent movement of
the scope. Movement makes the viewed scene appear to
dance or vibrate at high magnifications. Afirm mount will also
help you to locate, track and keep objects in the field of view.
The Discoverer’s tripod mount provides a convenient means
of fastening to any standard photographic tripod, car window
mount or shooter’s stand. For best viewing results, mount
your Discoverer on a firm support to prevent movement of
the scope. Movement makes the viewed scene appear to
dance or vibrate at high magnifications. Afirm mount will also
help you to locate, track and keep objects in the field of view.
LENS SHIELD
Unscrew and remove the lens caps from the objective lens
and eyepiece. The objective lens shield may be extended by
pulling it out from the end of the scope.
Unscrew and remove the lens caps from the objective lens
and eyepiece. The objective lens shield may be extended by
pulling it out from the end of the scope.
F O C U S I N G
The Discoverer used as a spotting scope will focus from 24
feet to infinity at any power setting with rotation of the Focus
Control Ring.
The Discoverer used as a spotting scope will focus from 24
feet to infinity at any power setting with rotation of the Focus
Control Ring.
Make sure the Telephoto Adjustment Control is turned
counter-clockwise as far as it will go.
counter-clockwise as far as it will go.
The depth of field (visual distance over which the image is
seen in sharp focus), and the area covered, is greater at the
lower powers. However, if the instrument is initially focused at
a low power you may find that additional focus adjustment is
required as power is increased.
seen in sharp focus), and the area covered, is greater at the
lower powers. However, if the instrument is initially focused at
a low power you may find that additional focus adjustment is
required as power is increased.
Some users may have difficulty re-focusing after zooming
rapidly to a higher power, this can be caused by the eye’s
inability to adjust quickly enough to the new magnification. It
will help to look away momentarily, then resume focusing.
rapidly to a higher power, this can be caused by the eye’s
inability to adjust quickly enough to the new magnification. It
will help to look away momentarily, then resume focusing.
USE WITH EYEGLASSES
By the use of its retractable eyecup, the Discoverer aff o r d s
the user the same eye relief (distance from the eye to the
eyepiece at which a full field of view is seen) with or without
eyeglasses. Turn the knurled eyecup clockwise for use with
eyeglasses - counterclockwise for normal use. Except in
cases of astigmatism, most users will choose to remove their
glasses since the focus adjustment accommodates for near
and far sightedness and a full sight picture is achieved
without disturbing side light.
By the use of its retractable eyecup, the Discoverer aff o r d s
the user the same eye relief (distance from the eye to the
eyepiece at which a full field of view is seen) with or without
eyeglasses. Turn the knurled eyecup clockwise for use with
eyeglasses - counterclockwise for normal use. Except in
cases of astigmatism, most users will choose to remove their
glasses since the focus adjustment accommodates for near
and far sightedness and a full sight picture is achieved
without disturbing side light.
Power
FOV At 1000 yds Exit Pupil
15x
156’
4.0mm
20x
11 7 ’
3.0mm
25x
93’
2.4mm
30x
77’
2.0mm
40x
58’
1.5mm
50x
47’
1.2mm
60x
40’
1.0mm
DISCOVERER SPECIFICATIONS
Power:
15x to 60x
Objective Lens:
60mm
Eye Relief:
15mm
Length:
17.5”
Weight:
48 oz.
Eyepiece Lens
Power Control Ring
Focus Control Ring
Objective Lens
Extendable Lens Shield
Tripod Mount
Model #78-1600
Lit. #: 91-0209/03-01
Continued on page 2