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Sometimes, when customers buy camera modules from us, they don't know what kinds of lens they need to use. There are lots of theory, articles or even calculators teaching people how to choose the correct lens, but after finishing reading, people are still confused, or maybe more confused.

 

In fact, what lens you need is largely dependent on where you want to install your cameras/camera modules. Do you want to install it in your room, your office, your cars, your big factory, your open backyard, your street, or your building? These different places with different observation distance use very different lens, so how to choose the suitable one among hundreds of different lens?

 

There are many factors to think about when choosing your lens, like focal length, aperture, lens mount, format, FOV, lens construction and optical length, etc, but in this article, I am going to emphasize on ONE factor, the most important factor when choosing lens: The Focal Length

 

The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 3.6 mm, 12 mm, or 50 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 2.8mm–12 mm.

 

The Focal Length is measured in mm. As a guide:

 

a short focal length (e.g. 2.8mm) = a wide angle of view=short observation distance

a long focal length (e.g. 16mm) = a narrow angle of view=long observation distance

 

The shorter the focal length, the greater the extent of the scene captured by the lens. On the other hand, the longer the focal length, the smaller the extent captured by the lens. If the same subject is photographed from the same distance, its apparent size will decrease as the focal length gets shorter and increase as the focal length gets longer.

 

In our company, the most common focal length are 2.8mm, 3.6mm, 4.0mm, 6.0mm, 8.0mm, 12.0mm. 16.0mm and others

See above photo, if you install the camera/camera module in your small bedroom/office room, the 2.8mm focal length is enough; if you want to put in your backyard, which is much bigger, then you need to use 4mm or 6mm focal length; If you use it in your street or in your factory, you might need 8mm or 12mm focal length, etc

 

Does this make you more clear about lens options? 

What lens do you often need?

What other method do you use to decide your lens?

Where do you install your cameras or camera modules?

 

Please feel free to leave your comment

 

 

 

 

 

 

CM Technology Company Ltd, which was founded in 2014, is a professional manufacturer specializing in designing, developing, manufacturing and marketing of all kinds of camera modules. 

 

Your most trusted partner for camera module solutions

 

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