Originally posted by RXrenesis8 For example, the FA 43 1.9 can resolve 53 lp/mm in the center of the frame when stopped down to ƒ/5.6.
Oh man, so much wrong information again ...
The FA 43 is certainly in one league with Zeiss SLR glass which means it resolves about 300 lp/mm in the center at its sweet spot aperture. You'll find threads of mine where I resolved 2μm details with such lenses myself, translating to 250 lp/mm. You did not understand that lens tests on the current internet are eventually limited by the testing camera's Nyquist frequency, at least in the way how they are typically done.
But it isn't your fault alone. There was a time when lenses were tested on an optical bench and correct figures were published.
Another wrong information I do constantly read is that the Bayer mosaic or AA filter reduces the sensor's resolution. This is false. The luminance channel has the same Nyquist frequency and sharpening techniques can cancel the lower MTF caused by the Bayer mosaic and AA filter. Only the color information has a lower spatial resolution which remains invisible because the human eye has the same deficit. The only real effect is that sharpening increases pixel noise or may fail with an image blurred because of other reasons.
Last edited by falconeye; 02-14-2012 at 04:24 PM.