After all, the OM-D sensor is Panasonic and ..

Started Apr 30, 2012 | Discussions thread
bobn2 Forum Pro • Posts: 56,285
Re: 16.6 does nto equal 16.9

Revenant wrote:

bobn2 wrote:

The image forming area is less than the total area, and it is quite common for companies using the same sensor to choose slightly different border masks. For instance, Nikon's and Sony's often have different pixel counts. One reason is that different companies pattern noise measures need different numbers of black masked pixels.

But we're not talking about the effective pixels here. There's a difference in the total number of photo sites. Can this number vary if the sensor is the same?

Yes, because the effective pixels are the proportion of the total pixels that are not masked.

Panasonic G3
Effective pixels: 15.8 megapixels
Sensor photo detectors: 16.6 megapixels

Panasonic GX1
Effective pixels: 16.0 megapixels
Sensor photo detectors: 16.6 megapixels

Olympus E-M5
Effective pixels: 16.1 megapixels
Sensor photo detectors: 16.9 megapixels

And there are counting issues too.

E-M5 is 4608×3456 = 15925248 - 16.1 megapixels?
GX1 is 4592 x 3448 = 15833216 - 16.0 megapixels?
G3 is 4592 x 3448 = 15833216 - 15.8 megapixels!

The difference is 16 pixels horizontally and 8 pixels vertically - quite within tolerances for the same sensor - for instance:

G1 = 4000 x 3000 = 12000000 - 12.1 megapixels?
E-P1 = 4032 x 3024 = 12192768 - 12.3 megapixels?

So, this is quite consistent with what has been seen before with Olympus and Panasonic use of the same sensor in fact, rather less difference than before.

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