Actually, quite a few lenses reach 200 lp/mm but at very low contrast.
MTF measurements with a camera/lens system highly depend on test methodology. I can produce 1400 or 4500 LWPH (at 50% MTF) from my lenses, depending on sharpening, I'm mostly using either LR 4.3 standard sharpening (3000 LW/PH) or sharpening set to zero (1400 LW/PH).
As long as all parameters are the same MTF is a valid comparison. The MTF normally given by vendors is either measured, calculated or designed by marketing departement. Any MTF that is 100% is not measured om MTF equipment.
Photozone publishes a lot of comparable MTF measurements, best source of information. I would say Photozone figures are somewhat comparable between different systems.
If a lens is advertised as having a resolution of 200 lp/mm, does this mean: 200 line pairs per millimeter sensor height?
I'm asking because today I stumbled upon C-mount lenses that were advertised as such, and that in principle, might be interesting to mount on to a Pentax Q via adapter.
However, if the above conjecture is correct, then 200 lp/mm would mean less than 1000 line pairs per picture height on a 1/2.3" sensor, and that resolution would seem anything but seductive.
Does anyone know whether I got this right?