Free Tools, Utilities, and Helpful Information
Please feel free to use the following tools and information to help you in your machine vision needs.
Tools & Utilities
This free utility performs conversions between different units in over 20 categories. Very useful for converting from English units to metric and vice versa.
Lens & Sensor
Back Flange Distance – The distance from the mount face plane to the image detector plane. Each mount has its own specification. This data is useful for optical designs.
Back Focal Distance
|C mount||17.526 mm = 0.690 inches||Standard for CCD cameras|
|CS Mount||12.5 mm = 0.492 inches||Alternate standard for CCD cameras, especially those with small sensor arrays.|
|F-Mount||1.831 inches||Nikon 35mm SLR|
|2/3 inch Bayonet mount||48 mm||This is normally called “B4 mount” or “Bayonet|
|1/2 inch Bayonet mount – general||35.74 mm||Various manufacturers, except Sony, use this mount (usually called general mount).|
|1/2 inch Bayonet mount – SONY||38 mm||Sony uses this mount (usually called “Sony mount” or “38-mount”).|
*When you want to use a C-mount lens on a CS-mount camera, you should use a 5mm thick CS-C mount adapter.
Similar adapters are available from C-mount to F-mount (Nikon) lenses.
Image Diagonals – Active image area on various sized CCD arrays.
|1/4″ chip||2.7 x 3.7 mm||4.6 mm|
|1/3″ chip||4.8 x 3.6 mm||6.0 mm|
|1/2″ chip||6.4 x 4.8 mm||8.0 mm|
|2/3″ chip||8.8 x 6.6 mm||11.0 mm|
|1″ chip||12.7 x 9.525 mm||15.9 mm|
Lenses for these chip sizes are actually designed to fill only this size array. Note that a 1″ chip only fills a 15.9 mm array size, which is about 5/8″. You can use a lens designed for a larger chip on a smaller chip. For example, you could use a lens designed for a 2/3″ chip (often called a 2/3″ lens” on a camera with a 1/2 ” array. F-mount lenses are designed to fill a 35 mm diagonal array.