Originally posted by rechmbrs There has been much discussion of the K5 sensor and how good it is.
I wonder if Pentax has different anti-alias filter and the light-collecting color filter above each electronic well on the Sony electronics. Seems I remember Pentax patents about color filters etc. Is this the reason cameras with the same sensor have different output?
RON C
The AA filters are all very similiar. Their thickness may vary slightly which means they require a bit different amounts of capture sharpening. Their color effect is probably very similiar esp. if everybody should really use lithium niobate.
The CFA filters vary (I'm not sure they are part of the microlens assembly). DxO-Mark has a page on the color transmission coffecients of the CAF filter. Pentax and Nikon seem to be similiar, Canon has a bit broader (read worse) red response.
The microlens assembly sometimes comes from the sensor manufacturer, sometimes from the camera maker. Pentax uses/used sensors from Samsung and Kodak which sold the sensor and microlens assembly as a single package.
For Sony, I'm not sure. You probably can buy it with or without the microlens assembly. It actually makes little sense if the camera maker designs it because it must be fine-tuned to the sensel architecture and manufacturing process. Sometimes, camera makers request a specification detail like Leica did for the M9. But AFAIK, Kodak still produced it.
Anyway, the microlens assembly in the sensor used by the K-5 is attached onto the CMOS layer and is part of the ceramic chip package you obtain from Sony.
And then there is an IR filter which does alter the color characteristic and sensibility too.