WARNING - technical thread - how are the red dots really made?

Started Sep 7, 2012 | Discussions thread
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Roland Karlsson
Roland Karlsson OP Forum Pro • Posts: 24,149
Re: Assumptions to start with:

Hornbrille wrote:

Thank you;-)

I just googled the distance between the IR-filter and the sensor: they are almost stacked on each other with maybe 1...2 mm between them. The same seems to be true for the Nikon D2X sensor (the astronaut picture). Maybe the grid is related to cameras with such a glue-on IR-filter. If the filter is further away from the sensor the reflection seem to not hit the sensor or they are larger and darker and just diminish overall contrast.

Interesting info

There is no way any classic optical effect could spread the image over such a large area at only 1-2 mm distance.

I think we nailed it down to diffraction - if not Seng can prove us wrong. She owns a DP1 without IR filter.

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