WARNING . . . Not To Be Used for
Personnel Protection
Never use these products as sensing devices for personnel
protection. Doing so could lead to serious injury or death.
These sensors do NOT include the self-checking redundant
circuitry necessary to allow their use in personnel safety
applications. A sensor failure or malfunction can cause either an
energized or de-energized sensor output condition. Consult your
current Banner Safety Products catalog for safety products which
meet OSHA, ANSI and IEC standards for personnel protection.
There are many lens options to consider, such as focal length, mounting style, and focus
locking. The two most critical lens considerations are mounting style and focal length. Banner
products use C-Mount lenses only. Before selecting the appropriate focal length, Field of View
(FOV) and working distance must be determined.
Banner offers C-Mount lenses of the following focal lengths (in millimeters): 4, 8, 12, 16, 25,
50, and 75. Other manufacturers’ C-Mount lenses may also be used.
The following sections provide a tour through the process of determining the Field of View,
working distance, and focal length:
For additional help, support is available from your local Banner representative or a Banner
Application Engineer. Application Engineers are available from 8:00
A.M. to 5:30 P.M. Central
Time, Monday through Friday, excluding holidays.
Field of View
Field of view (FOV) is the area of the inspection captured on the camera’s imager. The size of
the FOV and the size of the camera’s imager directly affect the image resolution (one
determining factor in accuracy). See the illustration below.
NOTE: The PresencePLUS Pro camera imager
size is 640 pixels wide by 480 pixels tall.
Working
Distance
Camera
Lens
480 pixels
(vertical FOV)
640 pixels
(horizontal FOV)
Imager
Banner Engineering Corp.
www.bannerengineering.com • Tel: 763.544.3164
•
Minneapolis, MN
•
USA
Field of View
P/N 69950 rev. B1
Page 5
Lens Selection Guide
Determining Field of View
To determine FOV size: Measure the size of the inspection area (inches or millimeters), and
allow extra area to accommodate any anticipated movement of the target object.
To verify that the FOV is sufficient for the required resolution:
1. Estimate the required resolution or minimum detection size; for example, will the inspection
measure to a tolerance of 0.1 mm? 1 inch? 10 feet?
2. Use the FOV Formula below to determine the maximum horizontal and vertical FOV that will
maintain the required resolution.
3. Verify that the calculated FOV is larger than the inspection area.
FOV Formula
Required Resolution x 640 pixels = Maximum Horizontal FOV
Required Resolution x 480 pixels = Maximum Vertical FOV
Calculated FOV Example
Approximate area of inspection is 3.0" by 3.5". Required resolution is 0.01".
For the required resolution, is the area of inspection an acceptable FOV?
Required Resolution x 640 pixels = Maximum Horizontal FOV.
0.01" x 640 = 6.4" Maximum Horizontal FOV.
Required Resolution x 480 pixels = Maximum Vertical FOV.
0.01" x 480 = 4.8" Maximum Vertical FOV.
The Calculated FOV (6.4" x 4.8") is larger than the area of inspection;
therefore, a 3.0" x 3.5" FOV is acceptable.
If the calculated FOV is smaller than the desired area of inspection, options are as follows:
Working distance is the distance between the back of the lens and the target object.
Camera
Working
Distance
Target Object
Some of the key factors that can restrict working distance are as follows:
• The minimum working distance of Banner’s standard lenses is about 2.5 inches. Banner’s
high-performance lenses and most C-Mount lenses have a minimum working distance of 14
inches (spacers can be used to reduce that working distance).
• The lens may need to be close to the target object to avoid light fluctuations.
• There may be physical constraints that limit where the camera can be mounted.
Focal length is the distance between the rear nodal point of the lens (the point where the light
rays leave the rear of the lens) and the camera’s imager and is specified in millimeters.
If more than one focal length seems appropriate for the application, consider the following:
• Cost: A lens with a shorter focal length is less expensive.
• Depth of focus capability: Depth of focus (focus tolerance) is the area in front of and beyond
the optimal point of focus in which the image quality remains acceptable. A longer focal
length provides less depth of focus; a shorter focal length provides more depth of focus.
• Distortion (see example below): A larger focal length lens provides a less distorted image.
Gauging and the pattern matching tools are sensitive to distortion.
Lens Extensions Table, Working Distances in Inches
inch table
These extensions, in lengths of 0.5, 1.0, 5.0, 10, and 20 millimeters, may be combined to
achieve a desired focal length. Extension lengths are in parenthesis.
FOV in Inches
(horizontal x vertical)
0.2 x 0.2 4.1 (40)5 (40)
0.3 x 0.21.6 (10)5.2 (30)7 (30)
0.4 x 0.32.1 (10)6.2 (20)8 (20)
0.5 x 0.42.6 (7)7.3 (15)9 (15)
1.0 x 0.85.2 (5)12.5 (10)17 (10)
1.5 x 1.17.8 (1)17.7 (5)26 (10)
2.0 x 1.510.4 (1)23 (1)34 (5)
2.5 x 1.913.0 (1)28 (1)40 (5)
3.0 x 2.315.6 (1)
3.5 x 2.62.9 (0.5)18.2 (1)
4.0 x 3.03.3 (0.5)21 (1)
4.5 x 3.43.8 (0.5)
5.0 x 3.84.2 (0.5)
5.5 x 4.14.6 (0.5)
6.0 x 4.55.0 (0.5)
6.5 x 4.95.4 (0.5)
7.0 x 5.35.8 (0.5)
7.5 x 5.66.3
8.0 x 6.06.7
8.5 x 6.47.1
9.0 x 6.87.5
9.5 x 7.17.9
10.0 x 7.58.3
10.5 x 7.98.8
11.0 x 8.39.2
11.5 x 8.69.6
12.0 x 9.010.0
12.5 x 9.410.4
13.0 x 9.810.8
13.5 x 10.111.3
14.0 x 10.511.7
14.5 x 10.912.1
15.0 x 11.312.5
15.5 x 11.612.9
16.0 x 12.013.3
16.5 x 12.413.8
17.0 x 12.814.2
17.5 x 13.114.6
18.0 x 13.515.0
18.5 x 13.915.4
19.0 x 14.315.8
19.5 x 14.616.3
20.0 x 15.016.7
Working Distances in Inches
4 mm
Lens
25 mm
Lens
50 mm
Lens
75 mm
Lens
Banner Engineering Corp.
•
Minneapolis, MN
•
USA
www.bannerengineering.com • Tel: 763.544.3164
P/N 69950rev. B7P/N 69950 rev. B7
Page 11
Lens Selection Guide
Focal Length Table, Working Distances in Millimeters
FOV in
Millimeters
(H x V)
5 x 4 104*115*
10 x 8 156*230*
15 x 1178*208*285*
20 x 15104*260*370*
25 x 1983130*313*425*
30 x 2375100156*365*510*
35 x 265888117182*417*595*
40 x 3067100133208*469*640*
45 x 3475113150234*521696
50 x 3883125167260*573773
60 x 4550*100150200313*677928
70 x 5358*117175233365*7811082
80 x 6067*1332002674178851237
90 x 6875*1502253004699901392
100 x 7583*16725033352110941546
110 x 8392*18327536757311981701
120 x 90100*20030040062513021856
130 x 9810821732543367714062010
140 x 10511723335046772915102165
150 x 11312525037550078116152320
160 x 12013326740053383317192474
170 x 12814228342556788518232629
180 x 13515030045060093819272783
190 x 14345831747563399020312938
200 x 150167333500667104221353093
225 x 169188375563750117223963479
250 x 188208417625833130226563866
275 x 206229458688917143229174253
300 x 2252505007501000156331774639
325 x 2442715428131083169334385026
350 x 2632925838751167182336985412
375 x 2813136259381250195339585799
400 x 30033366710001333208342196186
425 x 31935470810631417221444796572
450 x 33837575011251500234447406959
475 x 35639679211881583247450007345
500 x 37541783312501667260452607732
525 x 39443887513131750273455218119
550 x 41345891713751833286557818505
575 x 43147995814381917299560428892
600 x 4505001 00015002000312563029278
625 x 4695211 04215632083325565639665
650 x 4885421 083162521673385682310051
4 mm
Lens
Working Distances in Millimeters
8 mm
Lens
12 mm
Lens
16 mm
Lens
25 mm
Lens
50 mm
Lens
75 mm
Lens
*
Extensions
may be
added to
these 25- ,
50- ,and
75-mm
lenses as
indicated by
the given
lengths
(in mm) in the
mm table
.
8P/N 69950 rev. B
Banner Engineering Corp.
•
Minneapolis, MN
•
USA
www.bannerengineering.com • Tel: 763.544.3164
Page 12
Lens Selection Guide
Lens Extensions Table, Working Distances in Millimeters
mm table
These extensions, in lengths of 0.5, 1.0, 5.0, 10, and 20 millimeters, may be combined to
achieve a desired focal length. Extension lengths are in parenthesis.
FOV in Millimeters
(horizontal x vertical)
5 x 4 104 (40)115 (40)
10 x 8 156 (30)230 (30)
15 x 1178 (10)208 (20)285 (20)
20 x 15104 (10)260 (15)370 (15)
25 x 19130 (7)313 (10)425 (10)
30 x 23156 (5)365 (5)510 (10)
35 x 26182 (1)417 (1)595 (5)
40 x 30208 (1)469 (1)640 (5)
45 x 34234 (1)
50 x 38260 (1)
60 x 4550 (0.5)313 (1)
70 x 5358 (0.5)365 (1)
80 x 6067 (0.5)
90 x 6875 (0.5)
100 x 7583 (0.5)
110 x 8392 (0.5)
120 x 90100 (0.5)
130 x 98108
140 x 105117
150 x 113125
160 x 120133
170 x 128142
180 x 135150
190 x 143458
200 x 150167
225 x 169188
250 x 188208
275 x 206229
300 x 225250
325 x 244271
350 x 263292
375 x 281313
400 x 300333
425 x 319354
450 x 338375
475 x 356396
500 x 375417
525 x 394438
Working Distances in Millimeters
4 mm
Lens
25 mm
Lens
50 mm
Lens
75 mm
Lens
Banner Engineering Corp.
•
Minneapolis, MN
•
USA
www.bannerengineering.com • Tel: 763.544.3164
P/N 69950rev. B9P/N 69950 rev. B9
Page 13
Lens Selection Guide
Working Distance vs. FOV Graphs
The graphs in this section provide a visual comparison of FOV as a function of working distance
for lenses of the various focal lengths.
Note: Working distance and FOV must be known in order to use these graphs. See Field of
View on page 1 and Determining Working Distance on page 3.
The table below lists available C-Mount lenses. Use the link listed under Manufacturers Lens
Specifications for dimensions and aperture information where applicable.
DescriptionModelP/N
Standard C-Mount Lenses
4 mmLCF0468884
8 mm, focus lockingLCF0857298
12 mm, focus lockingLCF1257299
16 mm, focus lockingLCF1656522
25 mm, plasticLCF25R68885
25 mm, focus locking, iris locking, metalLCF25LR68886
50 mm, focus locking, iris locking, plasticLCF50L1R68887
50 mm, focus locking, iris locking, metalLCF50L2R68888
75 mm, focus locking, iris locking, metalLCF75LR70545
WARRANTY: Banner Engineering Corp. warrants its products to be free from defects for one year. Banner Engineering Corp. will
repair or replace, free of charge, any product of its manufacture found to be defective at the time it is returned to the factory during
the warranty period. This warranty does not cover damage or liability for the improper application of Banner products. This warranty
is in lieu of any other warranty either expressed or implied.
P/N 69950 rev. B
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