11-08-2011, 09:40 PM
[quote name='Rainer' timestamp='1320787482' post='12775']
You overlook one word in Wims post ... in this case an important one ... "inverse" ...
1/x + 1/y = 1/z
you calculated 1/x + 1/y = z
so .. take the inverse of 0.0438 ... and you are there!
Rainer
[/quote]
Yes, the inverse needs to be taken, but we are not there yet <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
The 3.2 X pixel spacing formula serves to calculate the aperture at which a sensor is diffraction limited, not the resolution <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='' />. I made that more clear in my post. The resolution obviously is the sensor height in pixels divided by the sensor height in mm, divided by two to get to lp/mm (Nyquist fequency expressed a different way). I added that to my original reply.
Kind regards, Wim
You overlook one word in Wims post ... in this case an important one ... "inverse" ...
1/x + 1/y = 1/z
you calculated 1/x + 1/y = z
so .. take the inverse of 0.0438 ... and you are there!
Rainer
[/quote]
Yes, the inverse needs to be taken, but we are not there yet <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.The 3.2 X pixel spacing formula serves to calculate the aperture at which a sensor is diffraction limited, not the resolution <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. I made that more clear in my post. The resolution obviously is the sensor height in pixels divided by the sensor height in mm, divided by two to get to lp/mm (Nyquist fequency expressed a different way). I added that to my original reply. Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....