Navitar and Fujinon video lenses
are the benchmark against which
all lenses should be measured.
Quality construction, coupled
with precision engineering, result
in video optics that are sharp,
high resolution and optically
precise.
We offer a complete range of
video lenses for every industrial
application. Video lenses from
Navitar are the ideal choice for
applications ranging from PC
board inspection to viewing glass
bottles on a production line.
Video Lens Selection
There are a growing number of
video imaging applications in
which a single, constant magnification factor and a fixed working
distance are required in order to
maximize contrast and performance. Navitar has responded
to this need with a wide range of
fixed focal length lenses.
Determining the necessary
parameters for video lens selection, including focal length, field
of view and image sensor size,
does not need not be an intimidating process. An understanding
of some basic optical terms and
relationships is all that’s required.
The information on the following pages will help you select the
lens that will work best for your
application. If you require further
assistance, please feel free to call
Navitar and speak directly to one
of our engineers.
74
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• email: info@navitar.com
Understanding Focal Length
and F/Number
Video lenses can be classified
into three categories according to
focal length: standard, wide angle
and telephoto. Focal length is the
distance between the camera sensor and the center of the lens. The
greater the focal length, the larger
the image will appear. Therefore,
the greater the focal length, the
more the lens becomes telephoto
in application.
Standard Lens
A standard lens doesn’t change the
size of the object being viewed.
Wide Angle Lens
A wide angle lens provides a
wider field of view and therefore a
smaller image of the object being
viewed than a standard lens.
Telephoto Lens
A telephoto lens produces a larger
image of a distant object. The
longer the focal length, the larger
the object will appear.
How to Determine the Lens Focal Length Required
To choose the proper lens for a particular application, the following factors must be considered:
• Field of View - The size of the area to be imaged.
• Working Distance (WD) - Distance from the camera lens to
the object or area under surveillance.
• CCD - The size of the camera’s image sensor device.
• You must be consistent. If you are measuring the width of
your object, then use the horizontal CCD specifications, etc.
If you are working in inches, then do your calculations in
inches and convert to millimeters at the end.
Distance Diagram
Low Mag Video Lenses
The f/number is an indication of
the brightness of the lens. It is the
measurement of the ratio between
the focal length and the diameter
of the entrance pupil (where the
light enters the lens). The f/number
is directly proportional to the focal
length and inversely proportional
to the effective diameter of the
lens. It determines the amount of
light reaching the camera sensor.
The smaller the value, the larger
the opening and the brighter the
image produced by the lens.
FL = CCD x WD
FOV
Consider this example: You
have a 1/3” C-mount CCD camera (4.8 mm horizontal). There
is a 12” (305 mm) distance between the object and the front
of the lens. The field of view,
or object size, is 2.5” (64 mm).
The conversion factor is 1” =
25.4 mm (round up).
Calculation in mm:
FL = 4.8 mm x 305 mm / 64 mm
FL = 1464 mm / 64 mm
FL = 23 mm Lens Required
Calculation in inches:
FL = 0.19” x 12” / 2.5”
FL = 2.28” / 2.5”
FL = 0.912” x 25.4 mm/inch
FL = 23 mm Lens Required
Please do not
confuse working
distance with object to
image distance. Working distance is measured from the front of
the lens to the object
being viewed. Object
to image distance is
measured from the CCD
sensor to the object.
To calculate the lens
focal length required,
you must use working
distance.
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Optical Characteristics
of Video Lenses
Image Size Chart
Image
Sensor
1/4”
1/3”
1/2”
2/3”
Image Size
Low Mag Video Lenses
Image Sensor Size (units in mm)
1”
Image
Circle
Ø4.0 mm3.2 mm2.4 mm
Ø6.0 mm4.8 mm 3.6 mm
Ø8.0 mm 6.4 mm 4.8 mm
Ø11.0 mm 8.8 mm 6.6 mm
Ø16.0 mm 12.8 mm 9.6 mm
HorizontalVertical
Image Size
A lens produces images in the form
of a circle, called the image circle. In
a video camera, the imaging element
has a rectangular sensor area (the
image size) that detects the image
produced within the image circle.
The ratio of the length of the horizontal to vertical sides of a video image
is called the aspect ratio, which is normally 4:3 (H:V) for a standard video
camera.
Relationship Between Angle of
View and Image Sensor Size
An important factor to remember is
that cameras with different image
sensor chip sizes (such as 1/4”, 1/3”,
1/2”, 2/3” and 1”), using the same
focal length lens, will each yield a different field of view.
Lenses designed for a larger image
sensor device will work on a new,
smaller size camera. However, if a
lens designed for a smaller format image sensor device (i.e. 1/3”) is placed
on a larger one (i.e. 2/3”), the image
on the monitor will have dark corners.
Camera to Monitor Magnification
Camera
Format
1/4”
1/3”
1/2”
2/3”
1”
76
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9” 14” 15” 18” 20”27”
57.2X88.9X95.3X114.3X127X171.5X
38.1X59.2X63.5X76.2X84.6X114.1X
28.6X44.5X47.6X57.2X63.5X85.7X
20.8X32.3X34.6X41.6X46.2X62.3X
14.3X22.2X23.8X28.6X31.8X42.9X
Monitor Size (diagonal)
Image sensor sizes are in a ratio of
1:0.69:0.5:0.38:0.25. This means that
a 1/2” format is 50% of a 1” format,
a 1/2” format is 75% of a 2/3” format
and a 1/3” format is 75% of a 1/2”
format.
Minimum Object Distance
Minimum object distance (M.O.D.)
indicates how close the lens can be
placed to the object for shooting. It is
measured from the vertex of the front
glass of the lens.
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Flange Distance
Distance between mechanical
mount surface and the image
sensor (in air).
C-Mount=17.526 mm / .690”
CS-Mount=12.526 mm / .493”
Back Focal Length
Distance between vertex of the rear
element lens and image sensor.
Flange Distance and
Back Focal Length
General
Lens
Formulas
C-Mount and CS-Mount Lens
Compatibility
When using a C-mount lens for a
CS-mount camera, a C/CS-mount
adapter (5 mm thick) is required
between the lens and the camera.
Angle of View
and Field of View
The angle of view is the shooting range that can be viewed by
the lens given a specified image
size. It is usually expressed in
degrees. Normally the angle of
view is measured assuming a lens
is focused at infinity. The angle of
view can be calculated if the focal
length and image size are known.
If the distance of the object is
finite, the angle is not used. Instead, the dimension of the range
that can actually be shot, or the
field of view, is used.
Focal Length
Parallel incident light transmitted
into a convex lens converges to
a point on the optical axis. This
point is the focal point of the lens.
The distance between the principle point in the optical system
and the focal point is referred to
as the focal length. For a single
thin lens, the focal length is equal
to the distance between the center of the lens and the focal point.
Zoom Ratio
Zoom ratio is the ratio of the focal
length at the telephoto end to that
at the wide end. A zoom lens
can change the size of an object
appearing on the monitor to the
extent specified by the zoom
ratio.
C-Mount and CS-Mount Lenses
C-Mount and CS-Mount Lens/
Camera Compatibility
Compatibility
C-Mount Lens
CS-Mount Lens
C-Mount
Camera
OK
NOOK
CS-Mount
Camera
(w/ adapter)
Angle of View
Field of View
Focal Length
OK
Focal Length
FL = CCD x WD/FOV
Magnification
m = Image Size/Object Size
Object to Image Distance
OI = [FL x (1+m)2 ]/m
OI = m(FL) + (FL+VOA+BF) + FL/m
VOA = Vertex to Vertex Lens Length
Object to Lens Distance
OL = FL + FL(m)
Lens to Image Distance
LI = FL + FL/m
(Approximate distance to the nodal
points: FL + FL(m) to the front vertex.)
F/# = 1/(2NA)
F/# = FL /Entrance Pupil Diameter
NA = 1/2 F/#
NA = Sin θ/2
Effective F/#
Eff. F/# = F/# (m+1)
Clear Aperture (Minimum)
Aperture = FL/(F/#)
Depth of Focus
DoF = 0.00002/NA2 (in inches)
DoF= 0.0005/NA2 (in mm)
NOTES:
All Fujinon “HF” lenses come with focus and iris locking screws.
* Using an extension tube longer than 5mm will increase the M.O.D. to 0.3m.
** Using an extension tube longer than 5mm will increase the M.O.D. to 0.5m.
No Filter ThreadØ27 P=0.5Ø25.5 P=0.5Ø62 P=0.75Ø62 P=0.75
C-MountC-MountC-MountC-MountC-Mount
757060900900
Wide 819 x 614
Tele 59 x 44
Wide 819 x 614
Tele 59 x 44
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• email: info@navitar.com
SWIR Lenses
Navitar’s fixed focal length SWIR lenses are specifically designed for
SWIR (short wave infrared) cameras and applications. Lenses are available in 25mm, 35mm and 50mm focal lenghths. These lenses are ideal
for a variety of imaging applications where SWIR cameras are employed
such as perimeter surveillance, food sorting, toll-way monitoring, border
and port security, quality control or aerial imaging.
Fixed Focal Length
ModelSWIR-25SWIR-35SWIR-50
Focal Length (mm)
Iris Range/F-Stop
Iris
Control
Object
Area
Focusing Range (meters)
Filter Diameter
Mount
Weight (grams)
total (0.5 mm, 1 mm, 5 mm, 10 mm, 20
mm, and 40 mm)
5 mm Extension Tube
Available Close-up Lenses
Model
CL3355
CL10055
ECL8072
CL12072B
Focusing Range
(mm)
333 - 250Ø55
1000 - 500Ø55
800 - 463Ø55
1200 - 574Ø55
Filter
Diameter(mm)
Video Lens Accessories
Range Extenders (for use with all lenses except SWIR)
The use of a range extender, installed between a lens and a
camera, will extend the focal length and increase the effective
aperture (F/number) of a video lens. For example, using the 2XE
range extender will extend the focal length by two times (2X)
and double the effective aperture of the following lens:
(2X) 50 mm, F/1.3 lens = 100 mm F/2.6
We also offer an extension tube kit, which allows you to turn
standard fixed focal length lenses into macro lenses. This kit
includes six extender tubes (0.5 mm, 1 mm, 5 mm, 10 mm, 20
mm and 40 mm) for extension from 0.5 mm to 76.5 mm. The
tube(s) mount between the camera and the lens, making it possible for you to focus a C-mount lens at a much closer distance.
Close-up Lenses (for use with Fujinon lenses only)
Fujinon close-up lenses may be screwed to the front ring of your
lens when you need to move closer to a subject than allowed by
the minimum object distance (M.O.D.) of the lens. The Fujinon
model number of the close-up lens designates the maximum
image-to-lens distance at the telephoto end (in cm), as well as
the filter diameter of the lens.
Available Control Boxes (for use with Fujinon lenses only)
ModelDescription
CRD-1A/B
CRD-2A/B
A = 6-pin type connector, B = 4-pin type connector.
Zoom and focus are motor-drive, auto-iris
Iris, zoom and focus are auto-drive
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Zoom 7000
Low Mag Video Lenses
Features
• Working distance
5” to infinity.
• Parfocal over entire
zoom range.
• Highest mag. 1.1X
at 5” (at camera).
The Zoom 7000 is a close-focusing macro
video lens with a working distance of 5
inches to infinity. This versatile lens is compatible with cameras 2/3” or smaller and is
specifically designed for use in applications
where objects over 1” in diameter must be
imaged. It offers unsurpassed clarity and
parfocal zoom capabilities over the entire
zoom range.
The Zoom 7000 is ideal for quality assurance, biomedical imaging, or assembly applications where an easy-to-view, sharp and
true-to-life magnified image of your product
can mean the difference between a shippable,
top-quality end product and a costly manufacturing failure.
The Zoom 7000 offers a 6:1 zoom ratio
or a 6X magnification power over a focal
range of 18 mm to 108 mm. It comes with
a close-up lens for imaging at distances
from 5” to 12”. When the close-up lens
is removed, the working distance extends
from 24” to infinity. Focus and aperture
control are standard Zoom 7000 features.
Navitar also offers an 18-108 mm Bayonet Mount Zoom Lens (3CCD Camera)
(1-11898) or a Zoom 7000 locking sleeve
(1-11736).
Example
Object size =
100mm x 50mm
Camera format = 2/3”
Criteria: All edges
should be visible at
low magnification and
high magnification
should show the object
at maximum magnification.
Looking at the chart
below, a 10” working
distance would allow a
108 mm wide object to
be imaged into a 2/3”
camera. Therefore,
something slightly less
than 10” would do for
an object 100mm wide
and would provide
maximum magnification at high zoom.
Zoom 7000 Field of View
2/3” High Mag. 2/3” Low Mag. 1/2” High Mag. 1/2” Low Mag. 1/3” High Mag. 1/3” Low Mag. 1/4” High Mag. 1/4” Low Mag.
Taken from 2/3”, 1/2”, 1/3” & 1/4” camera monitor systems with an approximate 10% overfi ll. All dimensions are in mm. Zoom adjustment comes with locking screw.
Iris and Focus adjustment can be modifi ed for locking screw upon request.
• Working distance of 16” to infinity when the builtin close-up lens is removed
• Very high resolution.
• C-mount is standard with CS-mount also available.
A 10X Macro Zoom Lens
The Navitar Zoom 7010 Macro Zoom lens is designed for use with a 1/3” or smaller camera. It has a
10X zoom ratio and a 7-12” working distance (W.D. of 16” to infinity when the built-in close-up lens
is removed). The 10X Macro Zoom lens allows close-up image capture without extension tubes or
close-up lenses and the up-to-10X magnification variable (zooming) capability allows small objects to
be expanded for close-up observation. The high resolution Zoom 7010 is ideal for visual inspection
of electronic and precision components, biomedical imaging, image processing, and magnification of
documents as a visual aid. C-mount is standard.
Low Mag Video Lenses
Zoom 7010 Field of View
W.D .
7”
8”
9”
10”
11”
12”
With Close-up Lens Removed
1’4”
1’8”
2’
3’
4’
Taken from 1/3” and 1/4” camera monitor systems with an approximate 10% overfi ll. All dimensions are in mm.
1/3” High Mag.1/3” Low Mag.1/4” High Mag.1/4” Low Mag.
The Zoom 7000E system is specifically designed for
use in educational applications where industrial inspection and imaging features are less essential. It offers
a 6:1 zoom ratio over a focal range of 12.5 mm to 75
mm. The Zoom 7000E system incorporates many of
the features of the Zoom 7000 and 7010 systems at an
attractive price.
It allows group viewing of dissections as you perform
them, without interchanging lenses and matching
special adapters. It’s ideal for continuous monitoring of
slowly changing processes such as embryonic development or fish and chick hatching. The Zoom 7000E
can also be used in conjunction with a VCR for taping
classroom activities for future reference.
Low Mag Video Lenses
Features
• Eliminates eyestrain
from prolonged microscope viewing.