Introduction to the magnification of optical prisms-adjustable focus lens

The image is too small relative to the magnification of the object

β = y ’/ y

= b / a

= NA / NA ’

= CCD camera element size / field of view actual size

Electronic magnification

Electronic magnification is the magnification of the image displayed on the CCD with the camera.

Display magnification

Monitor magnification is the magnification of the subject being displayed on the monitor through lens imaging

Display magnification = (optical magnification) × (electronic magnification)

Example: Optical magnification = 0.2X, CCD size 1/2 (diagonal length 8mm), display 14〃

Electronic magnification = 14 × 25.4 / 8 = 44.45 (times)

Display magnification = 0.2 × 44.45 = 8.89 (times) (1 inch = 25.4mm)

Field of view

The field of view is the size of the object that can be seen when the lens is connected to the CCD camera

The size of the field of view is: (CCD format size) / (optical magnification)

Example: Optical magnification = 0.2X, CCD 1 / 2〃 (4.8mm long, 6.4mm wide)

Field of view size: length = 4.8 / 0.2 = 24 (mm)

Width = 6.4 / 0.2 = 32 (mm)

可调焦镜头

Provided by Dehong Technology

Keywords: telecentric lens, industrial lens, camera lens, coaxial light lens, industrial light source, focus lens

contact us