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Zos Xavius
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The fact that IR conversions of DSLRs — e.g. for astronomy or IR photography applications — are possible at a fairly low cost is a strong indication of this. It's highly unlikely that those shops that offer DSLR IR conversion services go to the trouble of removing a bonded cover glass from a sensor's package. Where would they perform such a task anyway ? How would they prevent the contamination of the sensor's surface ? Do such conversion shops have access, say, to a semiconductor factory-class clean room ? Actually the low pass filter is indeed all on a piece of glass that sits over the sensor. The Bayer filter is printed on a substrate on top of the sensor chip itself. The microlenses are printed on top of that layer. The general design for most CCD/CMOS sensors with a cut filter/AA filter is the same. For IR conversion they typically simply remove the cover glass from the sensor and replace it with one that has an IR only filter or they just use plain glass which results in a full spectrum camera. They use slightly different filters IIRC for astro. You can actually remove the cover glass and scrape off the microlens/bayer filter layer and end up with a monochrome sensor. In light of this article, it makes me wonder if that was some of the motivation for the the Leica Monochrome. As far as clean rooms go, these shops typically tear down and fix DSLRs. Dust free environments are critical for this kind of work. I would imagine the sensor is blown with air extensively before the cover glass is replaced and that it is tested for dust entrapment. This is actually one way to fix DSLRs that have dust trapped below the low pass filter without replacing the sensor.
Toggle Commented Oct 18, 2013 on Two Reasons... at The Online Photographer
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Oct 17, 2013