Balluff MATRIX VISION mvBlueGEMINI Technical Manual page 36

Choice of the lens
You can calculate further parameters using the following formula (the focal length with the given
object distance, or with the given focal length the object distance):
Figure 4 Focal length formula
f = g * B / (G + B)
If the size of the sensor (B), the size of the object (G), and the object distance (g) are known, you
can calculate the needed focal length.
For a rough calculation a swift procedure is enough. If the object distance is noticeably larger than
the focal length, you will have the image scale immediately.
f / g = B / G
On our website, we offer a lens calculator:
https://www.matrix-vision.com/lens-calculator.html
mvBlueGEMINI Technical Manual (EN)
# if G > 10 * B
v2.6
35
APPENDIX