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What’sthe relationship between pixel size of sensor chip and digital magnification?
Published:2014-04-22 16:01:49    Text Size:【BIG】【MEDIUM】【SMALL

A table of parameters of some commonly used imaging sensors and the related digital magnifications

[Test condition: 1.3MP MDA1300 portable USB microscope with 2.0X objective lens and a computer with a MNS11701  17” screen set at display resolution 1280*1024 (screen display pixel size: 0.2625mm)]

Sensor pixels

Resolution

Packing size

Pixel size

Active area

(width*height)

Digital magnification

Total magnification

2.5X objective

0.35MP

640*480

1 / 4”

5.6μm *5.6μm

3.584 mm *2.688mm

46.8

117.2

1.3MP

1280*1024

1 / 3”

3.6μm *3.6mm

4.608 mm *3.686mm

72.9

182.2

1 / 4”

2.8μm *2.8μm

3.584 mm *2.867mm

93.7

234.0

2.0MP

1600*1200

1 / 3.2”

2.8μm *2.8μm

4.480 mm *3.360mm

93.7

234.0

5.0MP

2596*1944

1 / 2.5”

2.2μm *2.2μm

5.711 mm *4.278mm

119.3

298.0

From the above table we conclude that digital magnifications you get with your PC vary depending on the pixel size of sensor chip and has no relationship with resolution and size of whole sensor chip.



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