Why can't the shift lens be designed for autofocus?

As a sideline user, it is not necessarily correct to talk about your own views.

The structure of the paraxial axis leads to the use of interchangeable lenses in cameras, and it is difficult to manufacture autofocus lenses (currently only contac C).

G series off-axis autofocus), off-axis autofocus with non-replaceable lens has been developed perfectly more than 20 years ago.

The evolution of paraxial cameras from mainstream cameras to today's non-mainstream cameras means that neither production nor scale can compete with mainstream SLR. Therefore, most of the paraxial brands take the boutique route. The so-called boutique route is to turn the phase mechanism into a handed down product. Leica is the most typical representative. Leica paraxial lens in 1930s has a history of 70 or 80 years, and it still has excellent optical performance when connected to a micro single-phase computer. On the other hand, the optical performance of Nissan SLR lens in the middle of last century can no longer meet the requirements. Among them, the decisive factors are the strategy of fine route, more sophisticated technology, unique glass formula, top secret coating technology, patented optical structure that we are proud of. A simple example is the difference between the mass-produced domestic plum blossom watch and Rolex. The former has a life span of 30 days, while the latter still keeps the exact time of 100 years, which is not only good in technology, but also low in material cost.

Because niche+boutique+stacking+manufacturers show off their skills, any of the above factors are the key to the high price of paraxial lenses.