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Megapixel lens myth


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#1 Cesar Rubio

Cesar Rubio
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Posted 10 April 2012 - 02:07 PM

Here is a very good explanation about the “megapixel” lens for MVC's....

The Rule of thumb is:

The smaller the pixel size, the better lens you need!

But this video from 1st Vision clearly shows that some manufacturers ratings of 1MP, 5MP and 10 MP are not necessary true!

My advice, make your own tests.

http://tinyurl.com/cqg87xl


Thanks,
CR.
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#2 Cesar Rubio

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Posted 12 April 2012 - 08:49 PM

This is how you calculate the lp/mm lens needed for any given lens.

"A Line Pair per Millimeter (LP/MM) specification provides the resolution properties of a lens and can be used to help select the correct lens for your camera. LP/MM determines the smallest width of a pair of adjacent pixels that can be resolved by the lens..."

"...To calculate the LP/MM needed for a given camera, divide the width or height of the sensor in pixels by the physical width or height of the sensor in millimeters, then divide this number by 2. Dividing by 2 is necessary because LP/MM is defined for 2 adjacent pixels (a line pair)."

Pixels per chip width / width / 2 = LP/MM

So for a 2k sensor with 5.5 microns pixel size the width is 11.264mm -2048x0.0055-

2048/11.264/2=90.9 lp/mm.

The Kowa megapixel line is good enough...no need for the 10MP more expensive line.

http://www.machinevi...log/Details/128

CR.

Edited by Cesar Rubio, 12 April 2012 - 08:50 PM.

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