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.

*****.

** ******* *** ***** ************* ** ***** ***** ******* '*****' *** that ***** ****** ****** ***** *******. ** ********, ***** ** lenses *** ****** ****** ** ******** *** *** ****** ******* photography ****.

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

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

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

*******

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

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

*** ****** **********, *** **** *** ******** ***** **** **** image ******* ** ******** ** **** ******, ** ****** *** ** worth *********** *** *** * ***** ******* **** ***** *** increased **** *** ****.

*******

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

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

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

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

********** *** ** ***** **** ** *** **** **** ******** *********. When ********** ** ** **** **** ** ***** ******, ********* the **** ****** ******* * ******* **** ***** ** ***** into *****. **** ****** ** **** **** **** **** ******* twist ******* **** *** *******, **** **** ******* **** ** cameras, *** *** **** *** *** **** **** *****. ***** should **** **** *** **** ** ****** **** *********.

Test *********

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

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

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

******* ** ***** ******, *** ****** *** ********* ****** ****** image ******* ** **** ******** ** ********* ********* ***** ********. *** camera ** ** ******* ***** ** **** ** *** *********** below.

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

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

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

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

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

Calculation **********

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

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

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

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

** ****** *** **** ****** ******** **** */** ***** ******, and ********* **** ****** ** ******. ******* ** ****, ***** must **** **** ***** ******* ******** **** *** *** ****** ******/**** combination, ** **** *** **** *** ******* *** ******/** ***** lens *******, **** *******.

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

Comments (24)

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

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

***** *** **-*** ***** * **** ** ** ********* ****, but **** ******* *** **** *** ************ ****, * ******* price **** ***** **** *** ****. ******* ***** ***** ***** length *** ****** **** *** ****'* *** ******* *** ** a ***** **** ***********. * ***** ****** ***** **** */*.*, higher *****, ** ***** ****** *** ** **********. * ***** suspect ********** *********** ********* *** ***** **.* **** ** **** to * ****** ***** **.* ** **.*.

*** **-***** ***** **** **** **** *********** *** ** ****** ******* ***** ************ *** ********* ******** ** *** ****. **** ***'* ***** focus ** *** ******, *** ** *** **** ** ******, they ********** **.

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

*** *** ****** **** * ****** ****** ****, * **** obtained * ***** ***-*****-** *** *** ******, *** **** ******** CS>EF ***** ******* **** ** **** ****, *** * ***** 55-250mm **** **** (*******************) **** * **** ******** ** ******* **** *** *******. I've **** ******* ** **** *** **** *** *****, *** I've *** **** **** ****** **** *'* ****** ******* *** point ** ** *** ***** ********* **. *'* ********** ***** on **** ***** ** *'* **** *****'* ********* ****** ** straightforward **** *'* *******, *** *'* ***** ** **** ** mind **** ******* **** ** ** ***** ** ********* ***** imposed ** *** ******/*******/****.

** **** * **** ***** *****, * *** **** *** the ****** ** ***** ****** * ****** ****** **** *****. Regardless ** **** ******** * ****** ** *** ****** ** anything ****, ******** ******** *** ***** ** *** ****** ******** itself, ***** *** **** ***** ** *** **** (******** **-**% of *** ******) **** * *** ***** *** ** *****. I ** **** ** **** *** ****** ** ******* ***** and *** ** ** *****, *** **** * *** **** it ** ** ***** ***** ** ** *** *** ** to ***** *****. ***, ******** ******* ** ***** ******, ** simply *****'* ****. **'* **** *** ****** *****'* ******* *** ability ** "*****" ******* ** ***** ******, *** *** ***** ring ** *** **** *****'* ******* **********.

** ***** ********* * *** ****** ** *** ****** ** help **** ****? ******* **** *** **** **** ***** ** causing ****, ** *** * *** *** **? * **** some **********, *** *'* ** ******* **** ******** **** **** thinks, ******* **** ***** ** ****** ** *** "***" * lens ****/***'* **** ** ***** ** ***** ** *********.

*** *** ******, *** **** *********** **** ** *** ** that **** ** *** ***** **** * *** *** ** to **** **** ******* ** ********** ********* ***** (>** ***) at **** **** **** ****, **** * ***** ** ***** of **** **** ****. ** * *** ****** *** *** to *** *** ***** ** *****, *'* **** ** ******** winner ** ** *****...

***** *** *** **** **** ****? *'* *** * *********** expert ** *** ***** *** ********** ***** **** **** ***** things **** ***** ****** *** ** *** **** ** ** "reset" ** ** **** **** * ****** ***.

** ***** *** ****** ******** *****, * ***'* **** *** for ******** *** *** **** ****** ****** *******: ** *** lens *** ** ** (****** *****)? *****'* * ****** ****** at *** **** ****** ** *** **. ** **** ******, it ********** *** ***** *** ******* *** ********* ***** ** AF ****, ** ****** ***** ***'* ****.

******* ***** ********, *** *** ********* *** ***** ******'* *********, then *******, **** ************? ********* ** **** * ***** ** how *** ** *** *****, *** ** **** ***** ******* like **** **'* ********* ********.

*****, ***** ***. * ********** *** ****** (*** ********) *****.

***, * ** ******* ** **. * **** **** ******* once **** ********* **** *** *****, *** **'* **** ** MF *** ******.

* **** ***** ***** *********** ** *********, ****, *********. ****, backfocus, *********. *** **** *** *** ***** **. ** ******, no ********** ** *** ******.

* **** *** **** ***** ******** *** ******* *** *** what *******. *******, *'* *** **** **** ** ***** **** a **********, ******* * **** ** ***** **** *** ******+**** to *** ** **** ** *** ***** ******, ** ** appears **** ** ***** ** **** **** ***** **** ****** way? ***** ** ** ***** **** **** ******** ****, *******?

**** *'* ** ****** ********** ** *** *** ****** ***'** getting ** **** *****, ** ***'** ******* ** *****.

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

*** *** *** ** ** ****, ** ****** **** *** lens ***'* ******* ******* ** *** **** ***** ** *** sensor - ***** *** ******* ***'* ***** ******, ** ** cross-threaded *** ******* *******, ** ********* ******* ** ******** * "tilt-and-shift" ******.

****'* **** * ****** ***** ****, ** ****** ****, *** is ******** * ****** *****-*****, ** ** *** ***** ****** is ***** ********* ** *** *****, ** *** ** ******* the *****, ** **** *** ***** ** *** ****** ** the ** *******. ****, ***, ***** ********* *** *-* ******.

** ****** **** *****, ****** ****** **** ** ***** ******** help ******** *** *******.

****, ***** *** *** **** *****. **** ***********.

* **** **** *** *******, *** *** **** **** "***" off *** ***** ** *** ****** ** ***** */**" ** an **** ** ********. *******, * ******* *** ******** ***** lens (**-**) **** * *** **** *** ******, *** ** does *** **** *****, ** ****** *'** ********* ****** ** weakened *** ***** ** *** ***** ** *** ******, * don't **** **** **** ** * ***** ** *****. * can *** ** **** *** **** ***** *****, *** **** as **** ** * **** ******* **** **** *****, * don't **** **** **** ** * ****** *******. * *****, of ******, ** *****.

*** *** ****** *'* ******* **** *** ** *****, **** are ********* ** *** **** **'* *** ***** *******. ***** is ******* ************ ** *** *****, *** ** ******* ** the ****** **** ******* ** **********. * *** **** **** a ******* **** ******* *** **-***** ******* **** *'* ***** is ******** "******* **" *** ******** ** *** ****** ** the ****** ****** * ******* *****, *** * ******* *** I ***'* ******* **** ** ** ******.

*'* ******** ** ******* **** ***** *****'* ***** ***** ***** the **** ***** ** "*****" ***** ** **** ** **. There ** ** ***** *********** *** *** *** ***** **** wouldn't **** ** *** **** **'* *** *** ****** ** far ** * *** ****...*** *'* **** *** **** ** the ***** **** *** **. **** **** ** **** ***** and **** ***....

******** **** *** "*" ** ** ****** *** "*****", *** a ** ***** ***** *** **** * *** ****** ** the ****** **** * *-*****, ** **'* ******** ** **** focal *******, *** **** ******* ** *** **** ** ******** bumping ** ******* *** ******, ** ** ****** *** ***** to ** ** ***** ********.

*****'* ****** ******** *** * ******* *********: *** ***** **-* series ****** *** * *** ****** ** *** ****** **** the ** ******, *** *** ******** ************ *** *** **** sensors ** ***** ******** *** ******** *******. **-* ****** **** an ********** *** ** **** **** ******** **** ***** ******* to ** ******* (** ****** **** **** ** **-* *******), but **** *** *** ** *** ***, ******** *** **-* lenses ** ** **** ** ** ******. ***** *** ******** to ****, ************ ******** *** *** ** *****-****-***** ****** **** the **-* **-**** ** ** **** ** ****-***** *******, *** it's * ****** ***********, ******* *** **** ******* *** ********* with ** ***'* ******** ******, *** ********** *** ** ************ bad **** ****-***** ******.

** ******* ***** ******* ********, ** *** ** ** ** something: ** *** ******* ** ******** *** ** ******, ** EF-S *** ****** ** ******* *** ***** ** *** ****** to ***** ********. *** ***** *** ** *****'* ** **-**-* adapter *********, ** *** * *-**-** ******* ** *** ***** to **** *** **** * ****** ******* **** *** ******.

***** ******?

Ethan *** ** * ****** ***.

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

*** **** **** ****** ***** **** *** **** *** **** ring *************. *** ************** ***** *** *** **** **** **** *** ****** ** powered.

*******, **** ***** *****'* **** ***** *** ***** ** *** camera ******* ** *****, ********* ******* **. ** ****** ** working **** **** **** ** ***** ** **** ** ***** I ***'* *****, ** ** ***** **** ** *** ***** adjustments **** *** ****** *** *** ***** *******.

**, ** **** **** ** ** ****** **** ****** *** work ** ******* * **>*>** ******* ** *** ** ********* the **** **** **** *** ****** **** **** ******* ** ability ** ***** ***. *'** *** * *** ****** *'* going ** **** ** **** **** ** *** **** *******, but ** ****** **** *** *** ******** ** *****, ****** share ****.

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