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Description
The IFOV of IS640 fixed-focus lenses is disclosed in the lens name. For example, the IFOV of the IS640 20 Micron lens is 20 x 20 µm, meaning that each 20 x 20µm area on the target is focused on an individual camera sensor pixel.
Because the IS640 Macro lens has variable focus, IFOV depend on working distance.
Horizontal and vertical IFOV can be calculated according the following equations:
HFOV [mm] = (WD + 17.73) * (2 * tan(24.39°))
VFOV [mm] = (WD + 17.73) * (2 * tan(18.78°))
WD = Working Distance (distance from end of lens housing to target.
Horizontal IFOV [mm] = HFOV / 640
Vertical IFOV [mm] = VFOV / 480
Note that Horizontal IFOV = Vertical IFOV because the IS640 sensor pixels are square.