These are effectively T2.1 Zeiss ZF DSLR Prime lenses optimised to work with large sensor DSLR cameras rehoused in film lens housing to give superior focus movement.

Focus direction is the same direction as motion picture lenses, no reversible follow focus unit required.

Full frame coverage 24x36mm for focal lengths 21-85mm and all have front element of 114mm including 18mm.

300 degrees focus range.

Some people want to know why we have broken with tradition and do not supply a conventional 15 25, 35, 50, 85mm set. This is because these are not a speed-matched set with a common T stop, so this will become 18mm/T3.5 (slow), 25mm (T2.9), then the other 3 with common T2.1. Instead a 21mm has T2.9 and the other 4 are matched T2.1 we find a better combination.