Tuesday, June 18, 2013

How to Select the Lens for Your Megapixel IP Camera

Lenses for Megapixel IP Cameras
What lens should I use for my IP Camera?  Determining the right lens can be complicated and assuring that you get the right one requires some care.  This is a very important part of your IP camera system.  If you get a megapixel IP camera but don’t get the right lens you are wasting your money. 

Many IP cameras come with lenses.  For example the Axis P1354 comes with a 3 mm to 8 mm lens (100° - 34° horizontal field of view).   How do you determine if this will actually work in a specific application?  First make sure you know what the angle or mm of the lens should be.  The higher the mm numbers the lower the angle and the more magnification you will get.  It’s best to use the lens angle that is provided by the manufacturer instead of the mm of the lens since the angle can vary based on the size of the sensor.  

Lens Angle 
By measuring the field of view and how far away the camera will be from the area you want to view, you can calculate the angle of the lens.  To calculate the angle of the lens required you need to use trigonometry.  Don’t get upset, I slept through this class in high school as well.  I do remember my teacher saying, “You’re going to need this someday”, and me thinking, “Yeah, right”.  There are some calculators on line that can make this job easier.  Here is a review of the basics.   

 First we want to use the horizontal field of view rather than the vertical field of view, so let’s image we are looking down on the camera.  We split the triangle in half to get a right triangle.    

Then we can use the tangent function to calculate all the dimensions and angles.

The tangent (angle) = Opposite / Adjacent
In this case the dimensions we use are ½ the field of view (FOV) and ½ the angle, so the equation is:
The tangent (½ angle of the camera lens) = ½ the FOV / Distance from camera to FOV

Now we can calculate everything we need.  For example if the distance to the field of view is 100 ft. and the FOV is 50 ft. Here’s how we get the lens angle:

½ Tan(lens°) = ½ 50 / 100.
 Tan(lens°) = 2 x(½ 50 / 100)
Now I go to my on line calculator at http://www.pagetutor.com/trigcalc/trig.html and enter 25 where it says “Side A”, and then 100 into the “side B”, I get 14.04°. 
Then 2 x 14.04° = 28.08°.  

And of course, if you know the lens angle and want to calculate the FOV based on a certain distance, you can do this as well using the same equation and calculator.  

OK, your head hurts.  I understand.  Just take two aspirin and call us and we’ll do all the calculations. 

Other Specifications

Once you know the type of lens required you also need to review all the other lens characteristics for a specific application.  We reviewed all the lens specifications in our technical article Megapixel Lens for Megapixel IP Cameras, but here is a summary.  

Lens Format or Size: the lens size should be larger than the sensor of the camera.
Lens Mount:  There are 2 types of mounting formats used in IP cameras, C and CS type.  Make sure the lens you select matches the camera mount.
Iris:  There are manual adjustable irises, auto-iris and the latest p-iris.  If the lens is used indoors, you usually can use a manual iris camera, but outdoors you need an auto-iris lens.  If there are challenging lighting conditions then the p-iris is a good choice. 

 If you are using a megapixel IP camera then you must consider some additional specifications such as lens resolution, depth of field, iris control, and distortion, aperture and IR light capability. These are all very critical to assuring that you get the video that you expect.  If you get an inexpensive lens you certainly won’t be happy with the video.  

Yes, this is all complicated so please contact us for assistance.  We will review your objectives and make sure that your complete IP camera system performs exactly as you expect.  Please call us at 914-944-3425 or just use our contact form. 


Regina Dineros said...

Thanks for the tips here in this blog.. It helps me so much to select the right lens for my Megapixel IP Camera

Catherine Soriano said...

Great lenses forIP Home Security System

(y) Like It..

Crystal May Ann Cartel said...

Nice blog! Thank's for the tips now I know the right lens for my IP Home Security cameras.

pallavi pal said...

Our expertise in PC Hardware, Windows Operating Systems and CCTV systems guarantee fast, cost effective solutions.
Home Security Alarm"

Kamo R said...

It feels so nice to find somebody with some original thought on this subject. Really helpful to you for starting this security solutions ct.

Kamo R said...

uperb posts with lots of information!!! This is really the most miraculous blog site dude….
cabling services ct.

David Warner said...

Nice blog your doing really good job keep it up. It should have knowledge CPR training on your pets in case of serious condition.

cheap alarm monitoring

Vivek Singh said...

IP camera is one of the best option for maintaining security within your residential and commercial places. I am also using Panasonic IP camera and it is very good in terms of use.

Anonymous said...

Minneapolis-based security contractor Lloyd Security works with security systems of your choosing including Residential and Commercial Security.
wireless security

Ibrahim Chathiwala said...
This comment has been removed by the author.
David Noah said...

IP camera is one of the best option for maintaining security within your home and business places.

Security alarm system monitoring

君子之风 said...

Like your article, thank you for sharing.


君子之风 said...

Like your article, thank you for sharing.


Yan Kah Luke said...

Security Services are best offered with the use of CCTV Cameras in a place so it is a good option for setting up cameras to focus and analyze each & every movement

Susan Cheah said...

It is depends on each individual requirement, Vivotek has just launched a latest Fisheye version last 3 weeks, Vivotek FE8181V, this model has 5 megapixel....

Sebastian Loon said...

How can we just change the lens for our IP Cameras???

Claire Hall said...

for more information about the camera's lens and security cameras you can see this site:

Ben Wood said...
This comment has been removed by the author.
Anonymous said...

Great and informative information you have shared, which is knowledgeable. Thank for sharing. Keep me more updates.WorldEyeCam

Roney Wilson said...

I am really appreciating very much by seeing your interesting posts. frontpoint reviews

Deniel nash said...

Shard’s IP Camera Installation, wireless cameras and cloud cameras allow you set up a security system without the need to run wires around your home or business.


We provide Phone Systems to businesses across the UK, working with world-class manufacturers to offer a full range of telephony systems that can be tailored to your needs. We cater for businesses of any size, and offer a diverse product range from basic two-user phone systems through to multi-feature systems.

Sheamus said...

It’s amazing in support of me to truly have a web site that is valuable meant for my knowledge.Click To Aware

Sheena Martin said...

Your way to enlighten everything on this blog is actually pleasant, everyone manage to efficiently be familiar with it, Thanks a great deal. Gerard Devries

Ariel Eckblad said...

Thanks meant for sharing this type of satisfying opinion, written piece is fastidious, that’s why I’ve read it completely. residential locksmith West Palm Beach

Anonymous said...

I don’t suppose many of websites give this kind of information.

homeowners and car insurance bundles

Alex Steve said...

Awesome work! That is quite appreciated. I hope you’ll get more success.
I Spy You

Alex Steve said...

Your blogs and every other content are thus interesting and helpful it makes me return back again.
whole life insurance policy cash value

D Access said...

Nice blog.
ip camera surveillance system suppliers pune

amar bashir said...

A good Security system has a flexible and optimized surveillance system that is light and easily accessible. If any one wants to get more info please visit : http://www.strantin.com/

Shalom Enterprises said...

Get the best products with affordable cost. we provides high quality products to fulfill your security needs.
Boom Barriers
Sliding Gates
Solar power fence

electric door strikes

electro magnetic locks

Rising Bollards

make money from betting said...

I’m impressed with the special and informative contents that you just offer in such short timing.www.paydayloanexperience.com

Sultan Ali Aslam said...

Does Ufone Have 3G Coverage In DI Khan?
Does Ufone Have 3G Coverage In DG khan?
Does Ufone Have 3G Coverage In depalpur?
Does Ufone Have 3G Coverage In daska?
Does Ufone Have 3G Coverage In chiniot?

Shalom Systems said...

Thanks for posting the useful information to my vision. This is excellent information,.
boom barriers gates