David Grover / Phase One
New member
Thanks Nick. That is what I expected.
In the end, the entire issue of focusing accuracy comes down to the consistent production of lenses with dead on focusing ability that neither are back-focused nor front-focused and in which every lens element is centered. Otherwise, the entire focusing chain is thrown off, as the True Focus mechanism will just propagate any such errors in the lens itself.
Leica seems to have to go to a lot of trouble to ensure their lens consistency. I am still curious as to how Hasselblad achieves the same thing, and without the same costly effort as Leica.
Basically, Fuji are extremely proficient at lens manufacture and often underestimated in this field.
Add this with mechanical precision of aligning the sensor, fine tuning of the AF system to compensate for any mechanical intolerances, compensation of the IR cover glass, AF compensation for different Apertures and True Focus...
...gives you a very good auto focus system.