Depth of Field Tutorial

Author: John Honovich, Published on Oct 19, 2012

Ignore depth of field concerns for 95%+ of surveillance applications, despite what you hear. While this is a common consideration in digital photography, its goals and logistics differ. In this note, we explain the drivers, why it is generally not a surveillance concern and the exceptional application where it is plus what can be done.

Photographers Often Prefer Shallow Fields of View

************* ***** **** ** ********* * ********** ******* ** *** field ** **** ***** *********** ******** *** *** **********. ** do ****, **** ****** *** ***** ** *****. **** * look ** *** ***** *****. * ************ ***** **** ****** prefer *** *** ** *** ***** ** **** **** ********** the *********:

photog depth

*******, ** ************, ** ** *** ********. *** ****** ****** want * **** **** ***** ** ***** ** **** *** do *** **** ******* **** ***** ***** ********* *** ***** investigations.

Drivers ** **** ***** ** *****

*** ****** * ******* ** ** *** ***** ** *** FoV *** ********* *** ***** ** ***** **** **. **** can ****** ****** ******* *** ******* ** ********** ***** ***** to *** ****** ** * **** **** ****. ****'* ** example **** ******** ************ *** ******* ** **** *****:

close to camera

****** ** * ****, ***** ** ***** ** **** *** at * ****, ** ** **** ******.

***, ****'* ** ******* ***** *** ******* ** *** ********** **** ** **** *** *** ******* ** *** ***** of *** ***:

far but tight

In ************, *** * ****** *****

**%+ ** **** ***** ************ ******** **:

  • **** ***** ***** (*.*., * - ***)
  • **** ******** * ** **** **** **** **** *** ******

******* ** ****, ******* ***** ** ***** ** ****** *** a ****** ***** *******. ****** ** ****** *** *** ** these ********** **** ** ****** ** ** **** *** *** cause *** ******** ** *** *****.

Calculate *** ********

***** ** ***** **** *** ** ********** **************. **** ** a ********* ** ***** ********** ** *********.

***** ** * ***** * ****** ***** ******* *** *** drivers *** *** ********** ** ******:

The ************ *********

*** **** ******, ****** ***** ********** *********, ** **** * surveillance ****** **** * **** **** ** ******* *** **** the ******. ***** ** ** ******* ******* **** * *** foot *******.

fuzzy far

** ********* *** ******* ***** ** ***** *****, ******** ****-**** ** ****** *** **** *******.

*******, *** ********* ********** **** ** ** ***:

  • *** * ****** **** **** ** ***** **** *** **** and **** ** ***** *****. ** **** **** **** *** automatically ****** *** **** ******* ******** ***** ** ***** ********.
  • ****** **** *** **** **** ** ***** **/* ** ******** you **** ******. ******* **** *** **** **** ****** ******** image ******* **** **** ******** *** *****.

*** ** ***, ** *** ***** ***** ***** ** ***** but ** *** **** * **** **** ***** ** ** an *****, ***** ********* ***** *** ********* *** ****** ********.

Test **** *********

**** **** * ******** **** ***

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports on Tutorials

Glass Break Sensor Tutorial on Mar 21, 2017
Burglars often break glass windows to get into a house. Using glass break detectors in conjunction with alarm contacts is a good way to protect the...
Alarm Panic Switches Tutorial on Mar 16, 2017
Panic switches allow silently triggering an alarm system when it is otherwise disarmed. In this tutorial we explain and contrast the 7 most common...
Environmental Sensors For Burglar Alarm Tutorials on Mar 15, 2017
Intrusion detection systems can be used to alert users to environmental issues. By connecting sensors that monitor the heat, humidity, and...
Alarm Contacts Tutorial on Mar 07, 2017
Contacts are the devices that tell an alarm panel when an entryway is open or closed. The act of opening or closing an entryway, such as a door or...
Alarm Motion Detector Tutorial on Mar 06, 2017
Sensors designed to detect movement are a good way to protect large, open areas. In this tutorial, we examine motion detectors,...
Glass Doors and Access Control Tutorial on Feb 22, 2017
The biggest challenge for many access control systems are glass doors. Here's what happens when a maglock is improperly installed to an existing...
Alarm Panels - Canned vs Integrated on Feb 07, 2017
Alarm control panels generally come in one of two types: Integrated alarm controllers, with controls and the keypad in the same...
Surveillance Cameras 2017 Review on Jan 02, 2017
This report concisely explains the developments and most common options for surveillance cameras offered in 2017, including resolution, H.265, HD...
Lux Rating / Minimum Illumination Guide 2017 on Dec 23, 2016
Lux ratings are one of the poorest specifications to use in selecting cameras. Now, with the rise of integrated IR, they are increasingly...
The PPF / PPM Video Surveillance Guide on Dec 23, 2016
Pixels per foot / Pixels per meter is the most fundamental and valuable, though imperfect, metric for specifying video surveillance image...

Most Recent Industry Reports

Hikvision Hires Crisis Communication Writer on Mar 21, 2017
Hikvision has hired a crisis communication writer as the company ramps up its efforts to deal with the 'crisis' it feels it is facing. 'Crisis...
Glass Break Sensor Tutorial on Mar 21, 2017
Burglars often break glass windows to get into a house. Using glass break detectors in conjunction with alarm contacts is a good way to protect the...
Unikey Smart Phone Access Control Platform on Mar 21, 2017
More and more people carry smart phones. Many think this could replace the conventional key or card for access control. However, using a phone...
Hikvision Attacks IPVM on Mar 20, 2017
Hikvision has attacked IPVM repeatedly over the last month, both in the international press and in its dealer communications. Attacks Listed On...
VMS Update Automation Compared on Mar 20, 2017
Updating VMS software can be a tedious and time consuming processing, which historically has required users to access each machine, download update...
Anvil Traveler Threat Management Offering on Mar 20, 2017
A common component of enterprise security systems is traveler threat management, complementing the various physical security systems in place. One...
Simplisafe Warns Customers About Alarm Fines on Mar 17, 2017
Simplisafe markets themselves as a 'better way' than traditional professional alarm companies. However, in one key way, Simplisafe hides the...
Dahua US Imports - Here Is Their #1 Customer By Far on Mar 17, 2017
We have been reviewing shipping records of both Dahua and Hikvision products coming in to the US. This is to help prepare the Dahua OEM and...
Bill Gates Funded Startup Evolv Gets $18M For The "Most Advanced Threat Detection System" on Mar 17, 2017
Evolv Technologies has just raised $18 million, bringing its total to $30M, for developing what the company says is the most advanced threat...
Alarm Panic Switches Tutorial on Mar 16, 2017
Panic switches allow silently triggering an alarm system when it is otherwise disarmed. In this tutorial we explain and contrast the 7 most common...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact