Yclept Nemo kirjoitti viestissään (lähetysaika lauantai, 9. 
huhtikuuta 2011):
> Ah well! I have "Ø" symbol printed on the side of my Canon EOS
> 350, I was told this was the NPP point... 
> Anyone know what this point marks?

It marks the sensor plane location in the body. The no-parallax 
point is in the _lens_, not in the body. See the following 
documents:
http://www.johnhpanos.com/epcalib.htm
http://toothwalker.org/optics/cop.html#stitching
http://www.janrik.net/PanoPostings/NoParallaxPoint/TheoryOfTheNoParallaxPoint.pdf

-- 
 Markku Kolkka
 markku.kol...@iki.fi

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