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For any questions not covered here, please email us at industrial@schneideroptics.com.
- What is the meaning of 1 inch Video Format?
- What is the meaning of 2/3 inch Video Format?
- What is the meaning of 1/2 inch Video Format?
- What is a C-Mount?
- What is the difference between “C-Mount”
& “CS-Mount”?
- What is an F-Mount?
- What is a T2 thread?
- What is a Pentax thread?
- What is a Leica Thread?
- What is the difference between “Back Focal Distance”
and “Flange Focal Distance” of a Lens?
- What is considered the region of Visible Light?
- What is the wavelength region that a typical CCD can
image?
- What does CCTV stand for?
1. What is the meaning of 1 inch Video Format?
The actual image size (active area) = 12.8mm x 9.6mm with the image diagonal
= 16mm. The 1 inch (1” = 25.40mm) value that is used to describe
the common format name stems from the days of Videcon Tubes and was used
to describe the tube diameter and not the actual image size.
2. What is the meaning of 2/3 inch Video Format?
The actual image size (active area) = 8.8mm x 6.6mm with the image diagonal
= 11mm. The 2/3 inch (2/3” = 16.93mm) value that is used to describe
the common format name stems from the days of Videcon Tubes and was used
to describe the tube diameter and not the actual image size.
3. What is the meaning of 1/2 inch Video Format?
The actual image size (active area) = 6.4mm x 4.8mm with the image diagonal
= 8mm. The 1/2 inch (1/2” = 12.70mm) value that is used to describe
the common format name stems from the days of Videcon Tubes and was used
to describe the tube diameter and not the actual image size.
4. What is a C-Mount?
C-Mount is a camera / lens standard that is commonly found on CCD/CMOS
Digital Cameras as well as 16mm film cameras. The C-mount specification
has several dimensions associated with it:
Mounting Thread = 1 inch x 32 tpi UN 2A
Length of Lens Thread = 3.8mm
Lens Flange Focal Distance = 17.52mm
Camera Depth (C-Mount Face to Image) = 17.52mm
The above dimensions are employed by all C-Mount lens manufacturers as
well as all C-Mount camera manufacturers in order for any lens and camera
combination to image properly.
5. What is the difference between “C-Mount”
& “CS-Mount”?
The only difference between the two mounts = the Camera Depth (5mm delta):
C-Mount Camera Depth (Mount Face to Image plane) = 17.52mm
CS-Mount Camera Depth (Mount Face to Image plane) = 12.52mm
FYI – You can use any standard C-Mount lens on a CS-Mount Camera
by simply employing a 5mm extension tube. However, you can not use a
standard CS-Mount lens on a C-Mount Camera. All other aspect aspects
of the CS-Mount are the same as the C-Mount specification.
6. What is an F-Mount?
F-Mount was developed by Nikon and has become an industry standard for
numerous Industrial Camera companies as well as for Lens manufacturers:
Mounting Interface = Nikon F-Mount Bayonet
Camera Depth (F-Mount Bayonet to Image) = 46.5mm
Lens Flange Focal Distance = 46.5mm
7. What is a T2 thread?
The T2 thread (Metric Thread) = M42 x 0.75 pitch thread that is commonly
used to join a lens with a camera.
8. What is a Pentax thread?
The Pentax thread (Metric thread) = M42 x 1.0 pitch thread that is commonly
used to join a lens with a camera.
9. What is a Leica Thread?
The Leica thread is a hybrid thread that employs a Metric dimension for
the thread diameter as well as an English (inch) dimension for the thread
pitch:
M39 x 26Gg
Note – that the 26Gg pitch is very close to a pitch = 1mm. A true
Leica thread (pitch = 26Gg) will not properly secure to a Pitch = 1mm
(parts will seize).
10. What is the difference between “Back
Focal Distance” and “Flange Focal Distance” of a Lens?
Back Focal length of a lens = the distance between the last glass element
(outward facing vertex) to the image plane.
Flange Focal Distance = the distance between the lens mounting plane (thread
reference surface) to the image pane.
11. What is considered the region of Visible
Light?
The wavelength region commonly associated with “Visible Light”
= 400nm to 700nm (blue to red) that the human eye can see/image.
FYI – 1 nanometer (nm) = 1 x 10-9meters
12. What is the wavelength region that a
typical CCD can image?
A typical CCD or CMOS sensor that does not have any special wavelength
limiting filters can image light from the visible region into the near
infrared region:
400nm to 1200nm
FYI – 1 nanometer (nm) = 1 x 10-9meters
13. What does CCTV stand for?
CCTV stands for Closed Circuit Television.
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