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COR-2.5MM:

2.5mm Fixed Focus Lens for C-Mount Cameras

This very wide angle 2.5mm fixed focus lens fits C-mount cameras.

CS-Mount, C-Mount Cameras & Lenses

C- and CS-mount lenses are standard equipment on many traditional CCTV cameras. The two type of lenses differ in how they are mounted. The distance from the surface where the lens comes in contact with the camera to the focal point (the "flange back") of a CS-mount lens is 12.5mm (0.492"). This is 5mm shorter than a C-mount lens. Most professional cameras are CS-mount cameras and include a C-ring, so they can us a C-mount lens OR a CS-mount lens. You can't use a C-mount camera with a CS-mount lens - the lens won't fit.

Please contact a Sales Representative for Specification concerning this lense product as well as prices and availability.

  • 2.5mm optical glass
  • Manual iris
  • Fits CS-style lens mount
Lens Focal Length
Distance between camera and monitored zone
5-feet
10-feet

Millimeters

  •   2.45
  •   2.80
  •   2.97
  •   3.60
  •   3.70
  •   4.0
  •   4.30
  •   5.0
  •   6.0
  •   8.0
  • 12.0
  • 16.0
  • 25.0
  • 50.0

Horz area

  • 17.3'
  • 14'
  • 12.3'
  •  7.5'
  •  7.3'
  •  6.6'
  •  6.1'
  •  4.7'
  •  3.8'
  •  2.9'
  •  1.9'
  •  1.4'
  •  1'
  •  0.4'

Vert area

  • 13'
  • 10.5'
  •  9.6'
  •  5.7'
  •  5.5'
  •  5'
  •  4.6'
  •  3.5'
  •  2.9'
  •  2.2'
  •  1.5'
  •  1.1'
  •  0.7'
  •  0.3'

Horz area

  • 34.6'
  • 28'
  • 24.6'
  • 15'
  • 14.6'
  • 13.2'
  • 12.2'
  •  9.4'
  •  7.6'
  •  5.8'
  •  3.8'
  •  2.8'
  •  2'
  •  0.8'

Vert area

  • 26'
  • 21'
  • 19.2'
  • 11.4'
  • 11'
  • 10
  • 9.2'
  • 7'
  • 5.8'
  • 4.4'
  • 2.8'
  • 2.2'
  • 1.4'
  • 0.6'
15-feet
25-feet

Millimeters

  •   2.45
  •   2.80
  •   2.97
  •   3.60
  •   3.70
  •   4.0
  •   4.30
  •   5.0
  •   6.0
  •   8.0
  • 12.0
  • 16.0
  • 25.0
  • 50.0

Horz area

  • 51'
  • 42'
  • 36.9'
  • 22.5'
  • 21.9'
  • 19.8'
  • 18.3'
  • 14.1'
  • 11.4'
  •  8.7'
  •  5.7'
  •  4.2'
  •  3'
  •  1.2'

Vert area

  • 39'
  • 31.5'
  • 28.8'
  • 17.1'
  • 16.5'
  • 15'
  • 13.8'
  • 10.5'
  •  8.7'
  •  6.6'
  •  4.5'
  •  3.3'
  •  2.1'
  •  0.9'

Horz area

  • 86.5'
  • 70'
  • 61.5'
  • 37.5'
  • 36.5'
  • 33'
  • 30.5'
  • 23.5'
  • 19'
  • 14.5'
  •  9.5'
  •  7'
  •  5'
  •  2'

Vert area

  • 65'
  • 52.5'
  • 48'
  • 28.5'
  • 27.5'
  • 25
  • 23'
  • 17.5'
  • 14.5'
  • 11'
  •  7.5'
  •  5.5'
  •  3.5'
  •  1.5'
50-feet
100-feet

Millimeters

  •   2.45
  •   2.80
  •   2.97
  •   3.60
  •   3.70
  •   4.0
  •   4.30
  •   5.0
  •   6.0
  •   8.0
  • 12.0
  • 16.0
  • 25.0
  • 50.0

Horz area

  •   173'
  •   140'
  •   123'
  •  75'
  •  73'
  •  66'
  •  61'
  •  47'
  •  38'
  •  29'
  •  19'
  •  14'
  •  10'
  •   4'

Vert area

  • 130'
  • 105'
  •  96'
  •  57'
  •  55'
  •  50'
  •  46'
  •  35'
  •  29'
  •  22'
  •  15'
  •  11'
  •   7'
  •   3'

Horz area

  • 346'
  • 280'
  • 246'
  • 150'
  • 146'
  • 132'
  • 122'
  •  94'
  •  76'
  •  58'
  •  38'
  •  28'
  •  20'
  •   8'

Vert area

  • 260'
  • 210'
  • 192'
  • 114'
  • 110'
  • 100
  •  92'
  •  70'
  •  58'
  •  44'
  •  28'
  •  22'
  •  14'
  •   6'
Lens Focal Length
Distance between camera and monitored zone
5-feet
10-feet
15-feet
25-feet
50-feet
100-feet
Millimeters
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
  2.45
 17.3'
 13'
 34.6'
 26'
 51.9'
 39'
 86.5'
 65'
173'
130'
346'
260'
  2.80
 14'
 10.5'
 28'
 21'
 42'
 31.5'
 70'
 52.5'
140'
105'
280'
210'
  2.97
 12.3'
  9.6'
 24.6'
 19.2'
 36.9'
 28.8'
 61.5'
 48'
123'
 96'
246'
192'
  3.60
  7.5'
  5.7'
 15'
 11.4'
 22.5'
 17.1'
 37.5'
 28.5'
 75'
 57'
150'
114'
  3.70
  7.3'
  5.5'
 14.6'
 11'
 21.9'
 16.5'
 36.5'
 27.5'
 73'
 55'
146'
110'
  4.0
  6.6'
  5'
 13.2'
 10'
 19.8'
 15'
 33'
 25'
 66'
 50'
132'
100'
  4.30
  6.1'
  4.6'
 12.2'
 9.2'
 18.3'
 13.8'
 30.5'
 23'
 61'
 46'
122'
 92'
  5.0
  4.7'
  3.5'
  9.4'
  7'
 14.1'
 10.5'
 23.5'
 17.5'
 47'
 35'
 94'
 70'
  6.0
  3.8'
  2.9'
  7.6'
  5.8'
 11.4'
  8.7'
 19'
 14.5'
 38'
 29'
 76'
 58'
  8.0
  2.9'
  2.2'
  5.8'
  4.4'
  8.7'
  6.6'
 14.5'
 11'
 29'
 22'
 58'
 44'
 12.0
  1.9'
  1.5'
  3.8'
  2.8'
  5.7'
  4.5'
  9.5'
  7.5'
 19'
 15'
 38'
 28'
 16.0
  1.4'
  1.1'
  2.8'
  2.2'
  4.2'
  3.3'
  7'
  5.5'
 14'
 11'
 28'
 22'
 25.0
  1'
  0.7'
  2'
  1.4'
  3'
  2.1'
  5'
  3.5'
 10'
  7'
 20'
 14'
 50.0
  0.4'
  0.3'
  0.8'
  0.6'
  1.2'
  0.9'
  2'
  1.5'
  4'
  3'
  8'
  6'