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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

50mm DG Series Fixed Focal Length Lens

50mm Focal Length, #54-690

50mm Focal Length, #54-690
Stock #54-690
Qty 1-49
Qty 50+
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Focal Length FL (mm):
Maximum Sensor Format:
Aperture (f/#):
f/4 - f/18
Working Distance (mm):
240 - ∞
Maximum Image Circle (mm):
Numerical Aperture NA, Object Side:
Entrance Pupil Position (mm):
Exit Pupil Position (mm):
Object Space Principal Plane (mm):
Image Space Principal Plane (mm):
Primary Magnification PMAG:
Field of View at Max Sensor Format:
Horizontal: 77mm - 19.4°
Vertical: 57.8mm - 14.6°
Diagonal: 96.1mm - 24°
Horizontal Field of View, 4/3" Sensor:
78.7mm - 19.3°
Horizontal Field of View, 1.1" Sensor:
64.6mm - 15.9°
Horizontal Field of View, 1" Sensor:
58.2mm - 14.4°
Horizontal Field of View, 2/3" Sensor:
40.1mm - 9.9°
Horizontal Field of View, 1/1.8" Sensor:
32.8mm - 8.1°
Horizontal Field of View, 1/2" Sensor:
29.1mm - 7.2°
Horizontal Field of View, 1/2.5" Sensor:
26.4mm - 6.6°
Horizontal Field of View, 1/3" Sensor:
21.9mm - 5.4°
Horizontal Field of View, 1/4" Sensor:
16.4mm - 4.1°
Maximum Distortion (%):
Coating Specification:
λ/4 MgF2
Filter Thread:
M39.0 x 0.5 (Female)
Length (mm):
Maximum Diameter (mm):
Maximum Rear Protrusion (mm):
Number of Elements (Groups):
6 (4)
Iris Option:
Fixed Focal Length Lens
Weight (g):

Regulatory Compliance

RoHS 2015:
REACH 201:

Product Family Description

  • Lowest Distortion TECHSPEC® Lens (0.3% or Less Distortion)
  • Up to 9 MegaPixels,  2.8μm Pixel Size Sensors
  • Up to 4/3", C-Mount Lens
  • 18mm to 75mm Focal Length

TECHSPEC® 4/3" DG Series Fixed Focal Length Lenses utilize a Double Gauss design to provide high-performance, low distortion, compact size, and exceptional value, while exceeding the performance of typically available fixed focal length lenses. These lenses feature a mechanical design that allows the focusing movement to be motorized by the user, yields image resolution greater than 100 lp/mm, and have a standard C-Mount. For most applications, the camera-lens combination can be attached to workstations using the ¼-20 mount provided on the camera. TECHSPEC® 4/3" DG Series Fixed Focal Length Lenses include focus ring, manual iris, and set screws to facilitate a low profile integration in machine vision applications. Typical applications for the DG Series lenses include machine vision, assembly-line integration, and measurement and image analysis.

Note: Industrial Boom Stands are recommended for building vibration-free workstations.