How Far Can a PTZ See?

Author: John Honovich, Published on Sep 22, 2012

Knowing how far a PTZ can see is a critical but tricky question for PTZ use. On the one hand, seeing very far away is a common reason for choosing PTZs. On the other hand, we regularly hear people radically overestimate how far one can see with a PTZs (hundreds of meters and miles are commonly claimed).

In this note, we break down four key issues in determining how far a PTZ can see:

  • *** *** **** ** ** **** ******** **** *** **** to ***
  • *** ******* **** ****** *** **** **********
  • *** *** **** ******* ************* **** ****
  • *** ** ** **** **** ** ** *********

What *** **** ** ***

**** *** *****, ** *** ****** **** ***** **** **** critical ****. *** **** ** ***** ** ***** ***** **** you **** ** '***' - ** ** *** ******* ** a *** ** * ******* *****, *** ******** ** * person ** *** ******* ** ***** ****, ***. *** ********** here ** *******. **** *** ***** ** ***** ******* *** might ** **** ** *** ******** ** ****** ** ****, with *** *****, *** ***** ** ***** ** *** ** meters.

** ** *****, **** ** *** **** *** *********** * 'regular' ***** ****** *** *** ********** ** **** ******* ** overcomes ****. *******, **** *** *** ** ****** ** *** the ***, ** ******* * '*******' ***** ****** **** * very ****** ***. **** **** *** ***** ******, ** **** point, *** **** ** *** ****** ************* ******* *** ******* one *** '***' **.

Example: *** **** '****' **** ***

************* ********* ******* ***** **** ********** ****** *********. *** ********, an**** *********** ***** **** **** **,*** ********** **** ** "**** **** ***** *** **** **** *** zoom **** *** **** ***** *.* ** (* ****) ****." This ** *******, *****? ******* **** * **** ****. **** kind ** ***** ******* *** **** *** *******? *******, *** video ***** **** ** *** **** ** ******* *** **** **** ******, ***** *****:

text shown

**** ****** ** ****** ** **** ** ** ***** ***** being - ***** * ** * **** **** ** ~**,***% greater **** *** **** ** ******* ***** **********. ** *** are **** ** *** *.*% ** **** ********* *** *** using **** ** **** *** ***** *** ** *******, **** is *****. *** ******** ****, **'* ********* ** ****.

****** ****, ***** *** *** ***** ***** **** ******* *** need ** ***, *********** *** *** *** *** *** ** a ****** ********.

Why ******* **** ****** *** **********

** **** *** **** ****** *** ***** **** * *** zoom ****** *** *** * ***** ** **** ** * 32x **** ****** ******* *** ****** ****** ** ** '****' than *** ******. **** ** ********** ******. ** **** *****, the *** ****** *** **** *** **** ******** **** **** the *** ****. ******, ** **** ***** *** ***** **** camera *** *** *******.

******* *** *** *** ******** ***:

  • *** ******* (**** *********) **** *****
  • *** ***** ********** ** *** ******

*** **** ********* *** ***** ******* ****** *** **** ********* FoV. ** *** **** ** *** ***, *** ***** *** the ****** *** *** **********. **** *** **** *** ** the **** ********* ***** ** ****, **** ********* ** *******. Below ** ** ******* **** * ************ **** *****:

range example

** **** *******, *** *** ****** ** *** ******* (** the ****, *.*), *** **** ********* ***** *** ****** ********. Focus ** ******* ****** **** *********** ** **** ******** *** differences ** ******'* ***** ****** (**** **** **** ** * 35x ****** (*** / *.* = **)). *** ******* *** degree ** *** **** ********* ********** ***, *** ******* * PTZ **** ****** *** (******** *** **** **********).

*******, ********** ** **** ***. ** *** ****, **** *** PTZs **** **, *** ***** ** **** *** ***. ***, HD **** **** *** ***** ******* **** ****** *** ************ equal ** ******** ******* ** *** ****** *** *********. **** is ******* *** ********* ********** *********** *** * ******** ***** maximum ***. *** ***** ** ** **** ******* *** *******.

Why *** ******* ********** **

******* **** ******* ******* **** ***** ******* ** ***** *** foot (***) ** * ****** ** ***** ************** **** **** ******, **** ** ******** ******** *** *** ********. ** ******* lighting, *** ***** **** ** *** ** ******** ****** ******* but **** ******* ** ****** ***, **** *** **** ** 70 ** ***** *** ** ***** *** **** *** ** 150ppf (** *** *** ** **** ** *** ******** ** all).

** **** ***** **** ****. *********, *** ************ ****** * 'normal' ***** ****** **** * ******* **** ***** ****. *******, when **** **** *** ****, **** **** ** *** ********** long ****** (*****+ *** ******) *** **** ****** **** ********* (hundreds ** **** ** ***** *****). **** ******* **** **** issues - * **** ** **** ****** ******* *** **** light ** ********; ******** ******* **** ******, *********** ****** *** magnified, *** ***** *** *****, ***.

****'* ** ******* **** *** **** ** ~*** **** ******** with ~****** ** *** ****** ** *** ***. *** ***** quality ****** ** *********** - **** * ******** ***** (** ppf *** *****) *** ** ** ****** ********:

hd vs sd

How *** *** ****** ***?

**** *** ******** ********** ** ******:

  • ** **** *** ****** ******* ** ******* ******, ****** ** further **** ~*** ****** / ~*** **** **** *** ******
  • ** ******** * ******'* *******, ****** ** ******* **** ~*** meters / ~**** **** **** *** ******

** ******, **** ** **** **** **** ******** * **** end *** (** ** ~*** ****, ** ** ~*** ****) and **** ****** ********. *** *********** ** ****** ****** ***** away **** ******* *** *** ********** ** **** ****** **** things **** *****, *********, *********, ***. ** *** ***** * hugely ********* ********** ****** **** * ***** ** ****** ****, costing $***,***+ ***.

Why ** ** **** **** ** ** *********

*** ** **** ****, ** * ******** ***** ** **** how *** ***** *** *** ***, ** ** ******* ** do * **** ** ****. ***** *** *** **** ******* that *** **** **** **** *** *** **** *********** *** misunderstanding ** **** ***** *** * ****** (****** *** ********* underestimate **). *** ********* **** ***, ** *** *** ***** * *** ***** (** ***** too, ** ****'* ********* ** *** ********) *** ******** **** realistically *** ** **** ** **** ******** ****.

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