These aren't just cheap manual focus primes for smaller sensors. They are relatively fast, full-frame-compatible autofocus lenses, designed to compete directly with the optical behemoths of the world.
This 7Artistans 85mm f/1.8 prime lens, available initially just for Sony E-Mount and now for Nikon Z-Mount, is ultra competitive at just $299. For comparison, the name-brand Sony and Nikon 85mm primes ...
The autofocus system in the T80 works in the same manner as the focus assist system built into the earlier AL-1. A linear CCD is used to detect contrast in the focus area. When this area has the ...