Camera Focusing Tutorial

Published Oct 14, 2019 14:21 PM

Camera focus is fundamental to quality imaging. Mistakes can significantly reduce details, making cameras less effective.

free-image

In this guide, we explain focus issues and proper procedure, covering:

  • Fixed vs. Varifocal Cameras
  • Auto vs. Manual Focus
  • Two Fundamental Lens Controls
  • How to Focus
  • Using Autofocus
  • Potential Autofocus Issues
  • Manufacturer Focus Control Differences - Avigilon, Axis, Hikvision
  • Manual Varifocal Lenses
  • Manual Iris Lenses

Fixed ***** ****** *******

***** ***** ****** *******, **** ** way ** ********* *****, *** ****** used ** ************ ******* *****. ** many ****** *** **** *** *** be ********** ** ***, ******* ****** inside * ****** ** ****** ******* which ** *** ******** ** ** opened ** *** *****, ** ** the **** ** **** **** *******, surrounded ** ******* ** ** ************ with ** *** ** ******.

Factory Focused Fixed Lens

**** ** ******* **** ********** ******, the **** ** ***** *********** ***** in ***** *** *** ******** ** be *********. **** ***** **** ** focus ****** *** *******, ***** **** few ******* *** ** ******* *** camera, ******* ** ****** *********** ** place.

********** ******* ****** *** ********* ******* such ** ***** ****** ** ******* may ******* **** **** ***** ** make **** ***** ***********. ************, **** legacy ***** **** ****** *** ***** allow ***** **********. *******, **** ***** instances *** ******** ** ****.

Auto ****** ****** *****

*** ********* *******, ***** *** *** standard ***** ** *****:

  • **** *****/*********:** ********* *******, ***** *** **** a ****** *** ******* *** ****** to ************* ***** ******. **** *** be ****** *** *** ******'* *** interface ** ** **** ***** ** a ******** ****** ** *** ****** itself (*****). ********* ** ***** ** many **** *******, ********* *****, *******, turrets, ***, *** *** *******.

focus control inside dome

  • ****** *****:****** ***** ******** *** **** ** physically ****** **** *** **** ***** using ***** ** *** ******'* ****. Manual ***** ** **** ****** ** box *******, ****** **** **** ** bullet ****** *** ***** *******, ** well.

Autofocus *** **** ******

** ****, ********* ** ****** ** the **** ******** ** ********* *******. Previously, ** *** ********** * **** end, ******* *******. ***, ****** ***** is ********* ******* **** ** *********** cameras, **** **************** ***** ************ ***** ** *********** ** ** super ***** *********-*/********** ***** *** *********** ******. *******, even ***** ****** **** ** *** in *** ******* ** ******** ** autofocus, ****** ****** ***** *** ********.

******* ** **** *****, ** ***** autofocus **** ** **** ******, *** discuss ****** *****, ** ****.

Two *********** ********

**** ******* *** ********, ***** *** two ****** ********:

  • **** *****: ******* ***** ****** **** little ****** ** ****. ***** ******** are ********* ******* **** ******* ***, 0 ******* ******** (∞).
  • ****: ******* *** ****' ***** ** view, ***** ********** ******* *****. ********* labeled * (****) ******* * (*********).

***** ******** *** ***** ** *** web ********* ** ********* **** ****** or ******** ** *** **** ** manual ***** *******. ** **** ** differences *** *** ** *** ***** controls *****.

How ** *****

****** ***** *** *** ******* ****: always *** ** **** ****** *** focus. ******** **** ***** ***** ******** will ******* *** ******. *******, ***** are *** ******* ***** ****** ****:

  • ********* **** *********** **** ******:**** ********* ******* ************* ***** ***** while **** ** ******* *** ******* autofocus **** *** **** ***** ******. Because ** ****, ***** *** *** need ** ******** ******* ********* ** all.
  • **** ** ***** ** ***** **** level:** ***** *****, **** ********* *** zoom, *** ***** *** ****** ********* blurry *** *********** *** **** ***** may ** *********. ** *** ** necessary ** ***** *** *******, ** least *******, ***** ******* *** ****** to *** ******* ***** ** ****.

Using **** *****/********* ******

**** **** ***** ********* ** * helpful ******* *** ****** ************, ****** are ***** ********, *** **** ******** in **** *******. ***** ****** ********* fall **** *** ** ***** **********:

  • **** ***** *********:** ***** ******, *** ****** *** not ***** ** *** ******* ****** range, ******* ******** ** **** ** background *******. **** ** ***** ******** by ***** ** ****** ****** ** focus **, **** ** * ****** or **** *****, *** *** ******* manual ********** ** **** **** ***** in **** *****.
  • ***** ******* **** ********* **** *** to *****:**** ******* *** ******* ** **** focus **** ********* **** *** ** night **** *** **** *****. ** our *******, ***** *** ** ********* when ********* **** *** ** **** dark ****** **** ** ******* ** as *** ****** **** *** **** enough ***** ** ******* *****. ** these ******, ** ********* ********* **** feature ** ***** ******* ** ***** as ** ** **** ********* *** of ****** *****.
  • ******* ** ***** *****:** **** *****, *** ****** *** be ****** ** ***** ** *** desired ****** ******* ** ** ****** too ****/*** *** *** **** ** compensate. **** ** **** ****** *** box ******* **** **** **** ***** where ***** ** *** ***** ***** the ****** ***** ** *********, *** may ***** ** **** ********* ******* as ****.

*** ***** ***** ************ *** ********* process, ******* *** *** ****** ******** when *** ****** ** ** ******* states ** **** *****, *** *** three ****** ********* *****.

Manufacturer ****/***** ******** ****

****** ************* *** ********* ******** *** focus *** **** ** ***** *******, with **** **** ******* ******* *** simpler ** *** **** ******.

*** *******, ****' ******** *** **** simple, ******* ****/*** *** ****/****, **** slider ******** **** *** ****. **** is ******** ** *** *** ************* installers (*** ****** ********** ** **** cases), *** **** ****** ***** *** be ********* ** ***** *** ** buttons ***** ***** *** ********* ** "step" ***** ****/*** ** ****** *******.

Axis Zoom Focus Controls

******** ** ******* ** ****, **** a **** ***** ******, *** ******* used ** ******* ********* *** **** tune ****/*** (*/********) *****, ******** ***** control ** *****.

Avigilon Zoom Focus Controls

*********'* ******** *** ********* ** *** "PTZ" ***** *** *** ** *** live **** ** *** *** *********. The ******** **** ** **** ******, only *****, ***** *** ** ********* for **** *****. ************, ********* ** triggered ** * ****** ******* ****, which ** ***** "********* *****" ** its *******.

Hikvision Zoom Focus Controls

Manual ********* ****** (**** ** ****)

** ****** ***** *******, **** *** focus *** ******* ** *** **** itself, **** ***** ** ******* ***** (called "*******") **** ** ****** ****. The ***** ****** ** ***** ******** varies **** **** ** **** *** is ********* ******* ** *** **** below:

Manual Zoom Fine Focus Controls

** ******, ***** ****** **** *** puller *** **** ***** ** ** tighten *** **** *****/****. ** ****** models **** ****** ****** *** **** Back ***** **********, **** **** **** be ******** *** ** *** ****, with ***** ******* ******** ****** ********** auto ***** ** *** ******. **** adjustments ** ***** *** **** ** made **** *** ******'* *** ********* (demonstrated ** *** ***** *****).

Even **** ******: ****** ****

**** **** ****** ** ****, **** lenses ******* ****** ********** ** *** iris. **** ** ******** ***** * third ****/******, ******* ****, *** ********* in *** ****** ** *** **** between ***** *** ****. ********** ****** from ****** ** **** (* ** O), ********* **** *** *** *** open ****** ** **** ***** ** avoid ******** *** ***** ******** *** camera. ******* **** *********** **** *********** ** **** *** its ******.

****** **** ****** *** ********* **** in ******* ********, ****** ***** *** see ***** *********** ** ******** ******** or ********* *******.

Manual Iris Control

Camera ********* *** ******

**** ***** ****** ******* ** ***** and *** ******* ******. *******, ****** and ********* ******* *** ********* ** where ******* *** ******* *** *** much **** **** ****** ***** ** produce ******* *******, ******* *** ***** of **** *****. *** **** ***********, readers ****** **** ***:

[****: **** ****** *** ********** ******** in ****, *** ******* ************* ** 2018/2019 **** ********** *********** ** *** current ***** ** *** ******, ************* videos, *** ****.]

Comments (15)
UI
Undisclosed Integrator #1
Aug 09, 2018

*** ** *** **** **** *** of ***** ****** **** *** ******** opens (****** *** *******).   ?

 

********* *** ******* ** ******** *** done ****** ******** **********, *** ****** goes *** ** ***** ** *****

(2)
UM
Undisclosed Manufacturer #3
Aug 09, 2018

* ** ********* ***** *** ** mention ** ******* ******* ******* ***** used ** **** ** *** ******** process. 

**** *** ***** ** ********, *** iris ** ********** ****** ***** ********* depth ** ***** (*** ****** ** distances ** *****). 

**** *** **** * ******* ******* filter (****'** ****) ** ***** ** the ****, ** "******" *** **** into ******** **'* *********, *** **** opens ******** *** ***** **** *** depth ** *****. *** *** **** focus ** *** ******* ****** ********. There ***** *** ** ********* *** of ***** *** *** **** **** done *** **** *** ***. 

****, **** *** *-****** ** *** lens ***'** ***** (** **********) **** the ******. *** ***** (** "******") the *-****** ** *** ****, *** better *** *** ******* *** ***** performance ** **** ** ********* ***** of ***** ******** ** * "******" lens. 

** * ****** **** **** ***** ago, * *-**** "******" ********** * 50% **** ** ***** ******. *** example, ** **.* **** ****** **% less ***** **** ** **.*. ******* physicists, ****** ******* ** ** **** is ***-******. 

*** ***** ********* ******* ** ** the ****** ***** ** */* *** relies ** ** ** ********** *** scene. **** * ****** **** **** color ** */* **** **, ***** is * ***** ***** ***** *** cause *** ***** ** ** ****. I ***** **** ****** *** ** corrected ** ***** **** ******* *** not ***********. 

(3)
Avatar
Luca Fogliati
Aug 10, 2018

******* ** ******* *'* ****** *** a ********* ***** ***** (** *** focusing ** **** ** *** ***** conditions) ** ********* *** ******* ***** at */**** ** */****.****** **** ** black *** ***** ****,  *** **** opens ** ** **'* ***** *** you *** **** ***** ** * way **** ***** **** *** *** and ***** ********** .***** ***** ** no *** ** ******** *** ** different ***** ***** *** ** ***** at **** ***** **** **** ** on

Avatar
Corey Vavra
Oct 15, 2019

* *** ***** ***** ** * neutral ******* ******, *** ***** ******* it ****** **** *** * *** taught ** ***** ******* (**** ** the ***), **** *** *** **** open. ** **** * ******* ****** glass ****. $*.** ** *** ******** store. * ****** ****** ** **** the ***** ******* *** **** *** it ******. **** *** ***** **** just **** ***** *** ***** *** a ***** ***** **** ****.

(1)
TT
Tan Tharp
Oct 27, 2020
IPVMU Certified

*'** ***** ***** **** ******* ** cameras ******** *********** ** *****-**** *** to ** ****** **** *******. **** comment ** ********* ** ** ******** an **** *** ***** ******** ** testing ** ***** ******. ***** *** for *** ***!

UM
Undisclosed Manufacturer #4
Aug 09, 2018

#* ******* ***** ** ***** ** the **** **** ******** ***** ** allow *** * ****** ***** *****.  You **** ***** ****** **** * little ****** ** ***** ** ** illuminate *** *****. 

***** ***, * ************ ****** ***** out ** ** *** ****. 

Avatar
Howard Kohnstamm
Aug 10, 2018
IPVMU Certified

* ******* **** **** #* ****** for ******* *******. *'** ****** **** out ** ** ******** ******* *** years. ****'** ******* ****** ** **** as **** ******* *** **** ********** with *******/***** **** ****** *************.

Avatar
Ethan Ace
Aug 10, 2018
IPVM

*** *** ****** **** *****? **** cameras *** *** *****?

** **** ** ** ****** ******** to *** ******* ** ******'* ***** during ******** ** ******** ***** ****, but ** *** ******* *** ***** on ******** **** ******, ** **** not ***** ** ** ** * major ******* ** ****.

************, **** (******** ****) ********* ****** will ************* ******* *** ****** **** switching **** *** ** *****, ***** reduces ***** ****** *******.

**'* ******** **** ***** *** ** fine ***** ****** ** ******** *****, and * **** **** ********* **** sometimes, *** ** *** **** ******** of ***** *'** ********** ********* ** the **** ****** ** *****, ***** has **** **** ****** **** *** to *****.

 

(1)
UM
Undisclosed Manufacturer #2
Aug 09, 2018

***** ********.  *** ******* * ****** to **** ** **** * **** of ** ***** * ****** **** allow *** ** ******* ** ****-***** on * ********* **** ** *** scene.  **, ** *** ****-***** ** confused *** ***** ** ***** ** the ***** **** ** *** *****, you *** **** * ***, *** then ***** *** ****-***** ****** *** the ****** **** ***** ** **** part ** *** *****.

 

* ******** * **** - *** long ** ********* ****** **** ** perform ** ****-*****?  **** ** *** range *** **** ****?

Avatar
Ethan Ace
Aug 10, 2018
IPVM

** ******* *** ***** **** ** the ****** *****, ********. *** *** thing *'* ***** *** ** **** I've **** **** ***** **** *** be *********** ******* ** * ****** of *******. ** *** **** * slight **********, *** ********** ** ***** is ** *** *** **** **'* having ******* ** *** **** ******, I *****'* **** *** ***** **** change ****.

** *** ** ***** ****, *'* say ** ****** **** ***** *-* seconds ** ***** **. *'* *** "average" ** ******** *-*. * **** focus **** ** **** ******* *** take ******, ** ****, *** ****'* generally **** *********** ***** ******** ************* or **** **-************/**-*********** * **** ** the ************* ***** ******* **. 

Avatar
Luca Fogliati
Aug 10, 2018

***** ********* ** ***** ** *********** to ******* *** **** **** *** camera **** ** ********* **** *** image ** ** *****.* ***** **** the **** **** (***** *** ****?)** working **** ******** ** *** **** contrasted *****=*****. *** ***** ***** *** other ***** **** * ***'* **** so ** ***** ** *********** ** compare

CH
Charng Haw Guo
Oct 30, 2018
IPVMU Certified

***** *********** ***** *** *********** ******* of *** **** / ****** ***** setting / **********.  ***********!!

U
Undisclosed #5
Nov 19, 2018

***** *******.

JS
Joshua Stanley
Feb 05, 2019
IPVMU Certified

**** *******.  * ****** ********* **** of *** *** ******* **** ** use ******** ** *** ** ***** when ****** ** ***** ******** **** (36x).  * *** ******* ******* *** issue ** ******* *** **** * bit *** **** **** **.  * will *** *** **** ***** ***.

Avatar
Chuck Vivian
Jul 24, 2020

***** ****** ** *** ******* **********.