Focusing Tutorial

Author: John Honovich, Published on Oct 12, 2012

This tutorial explains the fundamentals of focusing including:

We focus on varifocal lenses, the most popular and commonly used type for professional surveillance cameras.

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  • *** *** ***** ** *****
  • ***** ******
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  • **** - ***** ********** ******* ***** *** ****** **** ***** the ***** ** **** ** ** ******** (****** ** ************)

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focus control top

****'* ******* **** **** *** ****:

focus profile

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manual iris lens

***** *** **** ******** *** **** ***** ** *** **, adjusting ** **** *** ****** *** *****. *******, **** **** you ** *** ****** **** ** ******* **** *** *** focusing. ****, ** **** *************, ****** **** ****** ****** ** kept **%+ **** ** ******** *** ****** ** ***** ******** at ***** ** **** *** **** **** ************ *** *** light ******.

How ** *****

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Where ** *****

** ******** ******** *******, *** ****** *** ** *** **** ** ***** focus ****** *** ******* **** ** ****. ***** *** **** likely **** ** ****** *** **** ***** ** *** *****, having **** ******** ******* **** **********, ** ***** **** *** see *** ***** *** *** ** ** ****** **** *** make ** **** ***********.

Field ******

*** ******* ******* **** ******** ** *** ***** ** **** cameras *** ***** ********* ** ****, ********* ** ***** ****** often *******. *** *********** ** ***** *** ***** ******** **** harder **** ***** ** ** ** ****** *****. ****, ** cameras, ****** ******, ********* ** *** ******* ****** ** ***** monitors. ****** *********** ****** ************ **** ******* *** ******.

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** ************ ******* ********** ** ** ******* ** *** ******* to ************* **** ***** *** ****** **** * **** ** the ****** ** *** ****** ** ******** *** * *** interface. *** ***** ***** ***** *** ** ** ** *** the ******* *********:

**** ******** ************** ********** ** ********* **, **** *** *********** ************ *** ******** higher ******* **** *** **** ****. *******, ******* **** ** are ********* **** ********* *** ********* ********* ** ****** *** lines.

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Test **** *********:

**** **** * ******** **** ***!

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