When talking about lens length are we referring to the length from the lens to the imager? Or the actual length of the lens?
Subscriber Discussion
Lens Length
JH
John Honovich
Jan 19, 2016The length of the lens, specifically what the lens length is specified as in the spec sheet (i.e., 3mm, 8mm, 15mm, etc.).
Also, to clarify, one would not physically measure the entire lens assembly as surely it would be longer than the lens itself.
KC
Kosit Chitpong
Jan 20, 2016Hello Stan,
The lens length is equal to the length from the lens to the imager for fixed lens but it is equal to the maximum length of the lens to the imager for varifocal lens. It is not the actual length of the lens.
Jv
J v E
Jan 20, 2016Maybe its better to say that the focal length "f" is the distance between lens en imager where the picture is sharp? So the crossing point "F"in this picture.
ol
oluwatosin lawal
Jan 20, 2016I understand that you talking about lens length to the imager but can you explain further how you calculate you lens length to get foV degree please
Jv
J v E
Jan 20, 2016Best to use the calculator..IPVM Camera Calculator V3
Normally this is also mentioned in the camera data sheets
BG
Bruno GRASMUCK
Jan 21, 2016Hi Stan,
In Matematics the formula is below :
AoV = H Aov (°) = 2 x arctan ( imager size / (2x f))
F = focal length
It that what you are looking for ?
ol
oluwatosin lawal
Jan 21, 2016Yes that is what am looking for but can you make sample of any avigilon product to get the foV
JH
John Honovich
Jan 21, 2016Oluwatosin,
You can use Avigilon cameras with our calculator to try out different FoVs. Here's an example below:
New discussion
Ask questions and get answers to your physical security questions from IPVM team members and fellow subscribers.
Newest discussions