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Lens Calculator
Security Cam Depot
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Field of View Calculator
For 1/3 Inch CCTV
Cameras
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Enter the distance to the target object, and focal length of the lens. Click "Calculate" to see the field of view you can expect with that lens.
"H" is the Horizontal or the Width of the picture in feet.
"V" is the Vertical or the Height of the picture in feet.
Field of View Calculator Instructions:
Lens Field Of View Chart
The numbers listed below should be considered accurate to within + / - 3° and therefore a few feet as well. This chart is intended as an approximate guideline to help select the appropriate lens.
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Lens Focal
Length
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Distance between video camera and the video subject area
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5' away
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10' away
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15' away
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25' away
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50' away
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100' away
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mm
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Horz area
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Vert area
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Horz area
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Vert area
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Horz area
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Vert area
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Horz area
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Vert area
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Horz area
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Vert area
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Horz area
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Vert area
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2.45
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17.3'
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13'
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34.6'
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26'
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51.9'
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39'
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86.5'
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65'
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173'
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130'
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346'
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260'
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2.80
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14'
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10.5'
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28'
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21'
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42'
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31.5'
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70'
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52.5'
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140'
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105'
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280'
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210'
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2.97
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12.3'
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9.6'
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24.6'
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19.2'
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36.9'
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28.8'
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61.5'
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48'
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123'
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96'
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246'
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192'
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3.60
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7.5'
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5.7'
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15'
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11.4'
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22.5'
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17.1'
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37.5'
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28.5'
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75'
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57'
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150'
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114'
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3.70
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7.3'
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5.5'
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14.6'
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11'
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21.9'
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16.5'
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36.5'
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27.5'
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73'
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55'
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146'
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110'
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4.0
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6.6'
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5'
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13.2'
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10'
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19.8'
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15'
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33'
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25'
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66'
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50'
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132'
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100'
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4.30
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6.1'
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4.6'
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12.2'
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9.2'
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18.3'
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13.8'
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30.5'
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23'
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61'
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46'
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122'
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92'
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5.0
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4.7'
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3.5'
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9.4'
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7'
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14.1'
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10.5'
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23.5'
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17.5'
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47'
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35'
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94'
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70'
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6.0
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3.8'
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2.9'
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7.6'
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5.8'
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11.4'
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8.7'
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19'
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14.5'
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38'
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29'
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76'
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58'
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8.0
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2.9'
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2.2'
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5.8'
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4.4'
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8.7'
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6.6'
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14.5'
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11'
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29'
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22'
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58'
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44'
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12.0
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1.9'
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1.5'
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3.8'
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2.8'
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5.7'
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4.5'
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9.5'
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7.5'
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19'
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15'
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38'
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28'
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16.0
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1.4'
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1.1'
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2.8'
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2.2'
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4.2'
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3.3'
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7'
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5.5'
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14'
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11'
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28'
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22'
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25.0
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1'
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0.7'
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2'
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1.4'
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3'
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2.1'
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5'
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3.5'
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10'
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7'
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20'
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14'
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50.0
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0.4'
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0.3'
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0.8'
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0.6'
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1.2'
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0.9'
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2'
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1.5'
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4'
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3'
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8'
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6'
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