Re: Damage from Visible Dust wet cleaning solution


"Dave Martindale" <davem@xxxxxxxxx> wrote in message
news:dd3g0c$3c2$1@xxxxxxxxxxxxxxxxxx
> >This also means that, at least in a D70, if you scratch anything while
>>"cleaning the sensor", it will be the surface of the IR filter, not
>>the colour-separation microfilters in front of the Bayer sensor or the
>>surface of the sensor chip as I have seen stated more than once on web
>>sites. I don't know where the antialiasing filter sits, but I would
>>expect it to be very close to the chip and therefore also not
>>vulnerable when "cleaning the sensor". Does anyone know for sure?
>
> It's probably sandwiched with the IR filter, and all of them mounted
> just in front of the sensor package. That's what Canon does, and I
> don't see any reason for Nikon to be any different. The AA filter
> doesn't need to be registered with the pixels of the sensor (unlike the
> Bayer filter) so there's no need to put it inside the sensor package.

Minor quibble: The Bayer filter isn't a separate unit but is manufactured
into the chip during the chip fabrication process, so there's never a
question of registration with the pixels. At least for the consumer dcam
sensors from Sony, so I presume also for the Canon CMOS sensors.

See the figure on page 2 here (although this is a video camera chip):
http://www.sony.net/Products/SC-HP/cx_news/vol20/pdf/icx226.pdf

David J. Littleboy
Tokyo, Japan



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