Testing EF Lenses On IP Camera

Author: Ethan Ace, Published on Nov 23, 2016

Glass.

IP cameras are often characterized as using lower quality 'glass' and that those lenses reduce image quality. By contrast, Canon EF lenses are widely viewed as superior and for higher quality photography work.

What if you put an EF lens on an IP camera? Would it make the image quality better?

We tested one of these models, the 70-200mm Canon EF70-200L against a high end Computar varifocal model, the 25-135mm H5Z2518C-MP, both on Axis' high end Q1635.

*****.

** ******* *** ***** ************* ** ***** ***** ******* '*****' and **** ***** ****** ****** ***** *******. ** ********, ***** EF ****** *** ****** ****** ** ******** *** *** ****** quality *********** ****.

**** ** *** *** ** ** **** ** ** ** camera? ***** ** **** *** ***** ******* ******?

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

[***************]

*******

** ***** ****** *** ******* **** ****** ********** **** ******* CS ***** ****** ** **** ******, ********* ****** ********* ** details *********. *******, **** ***** **** ***** ****** ****** ****** in ******** **** ** **** ****** *** **********, ******* ********* ** **** ****** *** ******* ******** ** similar *** ****** ***** ******* ***** *******.

************, ****** ** *********** *** ********* ******** *** ***** (**** longer) ****** *** ***** **** **** ******* ***** **** *********** them.

*** ****** **********, *** **** *** ******** ***** **** **** image ******* ** ******** ** **** ******, ** ****** *** be ***** *********** *** *** * ***** ******* **** ***** the ********* **** *** ****.

*******

** **** ******* ****** ******, **** ~$*** *** *** **** fixed ****** ** ********* ** ******* *** **** ***** ****** varifocal ******. *** *******, *** **-***** **** **** ** **** test ***** ****** ******* ***** $*,*** ***, ***** * **** ***** ********** *** ~$***. ******* **** ** ******* */** ***** ******, ***** ********* sell *** ~$***, **** *** **** ********* ****** ~$***-***.

*** ******* **** ** ******* ** ****** ** *** ** cameras ** **** ********* *** ~$**.

Lens *************

** *** *****, ** *** ** ****** **** ** ***** lenses ******** ******** ** ******** ** ***** ****** ***** *** adapter ****. *** **** **** ****************** *****.

********** *** ** ***** **** ** *** **** **** ******** difficult. **** ********** ** ** **** **** ** ***** ******, typically *** **** ****** ******* * ******* **** ***** ** locks **** *****. **** ****** ** **** **** **** **** adapter ***** ******* **** *** *******, **** **** ******* **** on *******, *** *** **** *** *** **** **** *****. Users ****** **** **** *** **** ** ****** **** *********.

Test *********

*** ***** ***** ***** *** ******* ****** ******, ******** ** ~320' *** ********* ** ~***' ** ** **** *****.

Depth ** ***** ******

**** **** **** ***** **** ***** ****** ****** **** ** the ** *** ** ****** ****** ****,***** ** ***** ********* ****** * *******. *** *******, **** ***** ********* *** the ****** **** ** *** ***** *****, **** ******* ****** blurry (~***' *** ******, *********** ** ***).

******* ** ***** ******, *** ****** *** ********* ****** ****** image ******* ** **** ******** ** ********* ********* ***** ********. The ****** ** ** ******* ***** ** **** ** *** comparisons *****.

Image ***********

*** ** *** **** **** ***** ****** ** *** ** models **** ** *** *******, ** ******* *** ***** *** very **** *****, ~***' (*** ***** **** ** *** ***** above).

** **** ********, ******* ********* ** *** ** **** *** notably *********, **** *** ******* ********** ****** ** *** ** mount *****. ***** ********** ** ************* ******* ***** **** ******, with *** **** ****.

** ~***' (~*****), *********** ****** **** **********. ******* ******* *** similar, *** ***** ********** ** ********* ** *** ** ***** lens.

*******, ** ~***' (~*****), ******* ******* *** ***** *******, *** legibility ***** ******** ********* ** *** ** ****.

Calculation **********

******* ** ****** *** ********* *** **** ** ************ ** with */**-***** *******, ***** *** ******* ******* *** *********** ***** of ****, ** **** *********** *** **** ***** ****** **** as ** ** *** ******* ******* *** ***** ******* **** as */*" ** */*", *** ** **** ******* *** *** EF ** ** *******, ***** **** ********** ***** ******.

** *** *****, ** ********** ****** ***** ** **** ** measuring ********* *** ***** ** * ******** ********. *** *******, setting *** ***** ** **** ** *** ******* ***** ****** (200mm) ******** ** * *' *** (*** ***** ** * standard ** ******* *****) ** ~**', ***** ******* ** * ~2.1 ****** ********** ***** ** ****.

***** **** ****** **** ** ****** ** ******* ***** *** error ** *** ***** ** ******** ****** *** ***** ** view **** ***** ***** ******.

Larger **** ****** ******* ******

** ****** *** **** ****** ******** **** */** ***** ******, and ********* **** ****** ** ******. ******* ** ****, ***** must **** **** ***** ******* ******** **** *** *** ****** camera/lens ***********, ** **** *** **** *** ******* *** ******/** mount **** *******, **** *******.

************, *** ***** ***** ** **** ******** *** *** ** large ****** ** *** *** ****** ** ****' ********. ************* offering ****** ****** ******, **** ** ******** **************** ********* ****** ******** **** ** *********** *-************** ******* ****** ***** ******* ******* ** ****.

Comments (13)

******** ***** ****** **** *** ***** **** *** **** *** their *-****** *****, ***** ** *** ***-**-***-**** ***-***** *****. *** can *** *** ****-*** ** (***-*) *** ***** * ***** the *****.

****** *** ***** **** **** ********* **-***** **-*** ** ***, F/2.8 ******, ** ***** */* ** */* *** ***** ** the *****.

*********** ****!

** *** ***** **** *** ** *** ******** ** *** real ****** ** *** ********* *********** ** *** ** **** vs *** ********?

**** ******* ***, **** *** ** *** * ****** **** the **** ******** **** *** ***** *** ********** *** ******* changing ***** *******, ***** *** ****** *** *********** ** *** two ******* ** ******** ** *** **** ***?

** ***** *** ** ** **** ****** ** *** ***** distances ** **** ****, ******* ****** ****** *** ********* ** render * **** **** ****** ***?

***********!

**** ******* **** ** ** ** *** ** ***** ******* that *** ***** *** *****'* **** **************?

***** ****! * ***** **** ** *** * ******* **** using *** **** ***** **** ** ***** ****** **** ** releases ***** **** *** ***** * ****** ***** **** ***** options **** *****, *****, ******, ***.

**'* ***** *** **** ** ** **** * **** ** clear "****" ** *** **** * **** **, **** ***** expensive **** **** *** ******** ******. ***** ** * ****** misunderstanding **** **** ********* *** **** "************ *******" **** *** better, ***** ** *** ****. *** **** ******* *** *** discussed ***** **** ********* ******, ** *** ** ***** **** of ** *************.

********* **** *** ******** *** ********* ***** ****, ***** ***** big ** **** ** *** *********** ****** **** ***** */** mount ** *** ****. *** *******, ** */*.* **** ** sensor, ** ***** *** **** ** **** > *****/** (**** Pairs *** ** ** ******) ** ***** ** ******* *** full **********, *** ******* ** **** ** ******** ** **** > *** **/**, ** ** *** *** **** ** ** lens *** **** *** * **** *** **** ********** ******.

*******, ** **** */* **** ***** *******, ** **** ***** to **** *****/** ** ******* *** ******, **** **** ******* EF **** *** ** ****** **** ******* */** ***** ****. the ***** ** **** **** ******* **** **** **** ***, and *** **/** ** **** ******, ***** *** ** ******* to *** ****** **********, ****** ********, *** **** ***** *********.

********** **, **** ** ****** ****** (**** */*), *** *** resolution (***** *** *****), ** (****** *****) **** *** **** noticeable ****** *********** **** ******* */** ***** **** (***** ***$).

*** *******, ** */*.* **** ** ******, ** ***** *** lens ** **** > *****/**...

** *** ***** **** **** ******** **** **** **** ***** with * ** ****** ******** ******** *****?

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

*** *** *** ****** **** ******* *** **** **** *** MTF ** *** ****** *** *** ****** ***** ** * lens.*** ****'* *** **** ** *** **** **** **** ***** cctv *******.

********, ** ******, *** ***** *** * *** **** */**-***** lens **** ******* ***** *****/**, ** ** *** ***** **** lens.

*** **** ** *** ****** ** ** ****, *** ********** is ******* ***** *** **/**, **'* *** ******** ** ** that ****. ********* ** * **** ***** ******, *** ********** is "*** ****" .

**** ***** ***** **** *** **** ***** ****** ** ******* designed ** ******* ********, ***** *****, ** *** > *** LP/mm ** * **** ***** ******. ******** *** **** **** MTF ** ******, *** ****** ** **** *** * ********** of ***** *** **/** ****.

** *** **** **** **** ***** ***** **** ** */*.* inch ** ******, *** ***** **** **** **-***** **** *** better **********.

***** **** **** *****-***** ****** ******* *** ***** **** **/**, like *** **** **** ** *******, *** **** **** ** Gopro *****.

*** ***** *** * *** **** */**-***** **** **** ******* about *****/**, ** ** *** ***** **** ****.

***** ****, ****'*?

*** **** ** *** **** ******** **** ***** **** ****** for **** ******.

**. ****** *** ***** **** **** ***** ********** **-***** ***** lens.

***, *** *** **** ** **** **** ** *********, **** ** *** ******* *** **/** ** *****?

**** ** **** ********** **** *** ****** ** */*" *** 1080p, *.* ****** ***** **** ***** ***** **** **** * lens **** *** **/** ***** ********** *** ******. (***** ** math, ******)

** ****** / ***** ******* *** ****** ** *** ****?

@*****, ** ***** *** ******** ** ****** **** **** ** a ** ** ****** ********** ******?

** **** *** *** ** **** ** *** ****** *** resolving ** ******* ****** **** *** ******* ***** ***** *** discriminate.

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

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