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Monochrome sensor conversion... seeking advise

Started Nov 7, 2016 | Discussions thread
khunpapa
khunpapa Senior Member • Posts: 2,666
Re: Monochrome sensor conversion... seeking advise

bclaff wrote:

Meuh wrote:

Any reason why you wouldn't buy a Sigma Merrill and use that in B/W selecting the blue channel only?

Photons of different energy (wavelengths) penetrate the silicon to a different depth.
Using only the blue (top) plane would not capture all the visible wavelength; only predominantly blue. You'd miss the green and red wavelengths that penetrate deeper.

You misunderstand this . Practically, that's Sigma's early statement's fault.

The top layer is only 1 uM thick (thin?). It absorbs all R G B photon. But because it's so thin & the P-N is doped to be higher band gap, the G & R (& some B) photon pass the top layer P-N junction almost without any interaction.

That's what's behind Sigma's new Quatro sensor. The top layer determines the resolution and color. The middle green and low red has 4 times larger P-N area to capture the remained photon, thus not only provides more accurate color information but also increases the QE considerably (1 stop, or 100%).

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