How Far Can a PTZ See?

By John Honovich, Published Sep 22, 2012, 12:00am EDT (Info+)

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:

  • *** *** **** ** ** **** specific **** *** **** ** ***
  • *** ******* **** ****** *** **** misleading
  • *** *** **** ******* ************* **** PTZs
  • *** ** ** **** **** ** so *********

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

**** *** *****, ** *** ****** skip ***** **** **** ******** ****. You **** ** ***** ** ***** about **** *** **** ** '***' - ** ** *** ******* ** a *** ** * ******* *****, the ******** ** * ****** ** the ******* ** ***** ****, ***. The ********** **** ** *******. **** the ***** ** ***** ******* *** might ** **** ** *** ******** of ****** ** ****, **** *** later, *** ***** ** ***** ** get ** ******.

** ** *****, **** ** *** same *** *********** * '*******' ***** camera *** *** ********** ** **** zooming ** ********* ****. *******, **** the *** ** ****** ** *** the ***, ** ******* * '*******' fixed ****** **** * **** ****** FoV. **** **** *** ***** ******, at **** *****, *** **** ** the ****** ************* ******* *** ******* one *** '***' **.

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

************* ********* ******* ***** **** ********** market *********. *** ********, ****** *********** ***** **** **** **,*** views***** **** ** "**** **** ***** PTZ **** **** *** **** **** you **** ***** *.* ** (* mile) ****." **** ** *******, *****? Reading **** * **** ****. **** kind ** ***** ******* *** **** now *******? *******, *** ***** ***** text ** *** **** ** * nearly *** **** **** ****** [**** no ****** *********], ***** *****:

text shown

**** ****** ** ****** ** **** as ** ***** ***** ***** - maybe * ** * **** **** or ~**,***% ******* **** *** **** of ******* ***** **********. ** *** are **** ** *** *.*% ** Axis ********* *** *** ***** **** to **** *** ***** *** ** tankers, **** ** *****. *** ******** else, **'* ********* ** ****.

****** ****, ***** *** *** ***** about **** ******* *** **** ** see, *********** *** *** *** *** see ** * ****** ********.

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

** **** *** **** ****** *** think **** * *** **** ****** can *** * ***** ** **** as * *** **** ****** ******* the ****** ****** ** ** '****' than *** ******. **** ** ********** untrue. ** **** *****, *** *** camera *** **** *** **** ******** more **** *** *** ****. ******, in **** ***** *** ***** **** camera *** *** *******.

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

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

*** **** ********* *** ***** ******* widest *** **** ********* ***. ** you **** ** *** ***, *** range *** *** ****** *** *** irrelevant. **** *** **** *** ** the **** ********* ***** ** ****, best ********* ** *******. ***** ** an ******* **** * ************ **** sheet:

range example

** **** *******, *** *** ****** is *** ******* (** *** ****, 1.7), *** **** ********* ***** *** camera ********. ***** ** ******* ****** than *********** ** **** ******** *** differences ** ******'* ***** ****** (**** that **** ** * *** ****** (119 / *.* = **)). *** smaller *** ****** ** *** **** telephoto ********** ***, *** ******* * PTZ **** ****** *** (******** *** same **********).

*******, ********** ** **** ***. ** the ****, **** *** **** **** SD, *** ***** ** **** *** key. ***, ** **** **** *** lower ******* **** ****** *** ************ equal ** ******** ******* ** *** across *** *********. **** ** ******* the ********* ********** *********** *** * somewhat ***** ******* ***. *** ***** ** ** **** ******* *** details.

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

******* **** ******* ******* **** ***** density ** ***** *** **** (***) as * ****** ** ***** ************** **** **** ******, **** ** ******** ******** *** low ********. ** ******* ********, *** might **** ** *** ** ******** facial ******* *** **** ******* ** direct ***, **** *** **** ** 70 ** ***** *** ** ***** may **** *** ** ****** (** may *** ** **** ** *** anything ** ***).

** **** ***** **** ****. *********, PPF ************ ****** * '******' ***** camera **** * ******* **** ***** lens. *******, **** **** **** *** away, **** **** ** *** ********** long ****** (*****+ *** ******) *** view ****** **** ********* (******** ** feet ** ***** *****). **** ******* many **** ****** - * **** is **** ****** ******* *** **** light ** ********; ******** ******* **** harder, *********** ****** *** *********, *** image *** *****, ***.

****'* ** ******* **** *** **** at ~*** **** ******** **** ~****** in *** ****** ** *** ***. The ***** ******* ****** ** *********** - **** * ******** ***** (** ppf *** *****) *** ** ** fairly ********:

hd vs sd

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

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

  • ** **** *** ****** ******* ** license ******, ****** ** ******* **** ~100 ****** / ~*** **** **** the ******
  • ** ******** * ******'* *******, ****** no ******* **** ~*** ****** / ~1500 **** **** *** ******

** ******, **** ** **** **** this ******** * **** *** *** (SD ** ~*** ****, ** ** ~20x ****) *** **** ****** ********. Any *********** ** ****** ****** ***** away **** ******* *** *** ********** in **** ****** **** ****** **** ships, *********, *********, ***. ** *** using * ****** ********* ********** ****** with * ***** ** ****** ****, costing $***,***+ ***.

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

*** ** **** ****, ** * prospect ***** ** **** *** *** their *** *** ***, ** ** crucial ** ** * **** ** site. ***** *** *** **** ******* that *** **** **** **** *** too **** *********** *** **************** ** just ***** *** * ****** (****** you ********* ************* **). *** ********* **** ***, ** *** *** ***** * few ***** (** ***** ***, ** that's ********* ** *** ********) *** document **** ************* *** ** **** on **** ******** ****.

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