pdk42
Moderator
I guess a full explanation would get into Airy discs and MTFs, but I think an intuitive understanding can be gained by thinking in terms of the perfect lens and the perfect sensor. A perfect lens on a low res sensor will deliver acuity limited by the sensor. A perfect sensor with a soft lens will deliver acuity limited by the lens. With both being imperfect the end result is the product of them both. Improve either and the end result improves.I remember you citing Roger Cigala before on this subject, but if a lens is producing blurry details surely you'll only achieve higher resolution blurry details.