The Dulens APO Mini Prime set spans 21-110mm with T2.4-T2.6 apertures, full-frame coverage, and apochromatic correction for low chromatic aberration. All six lenses share an 80mm front diameter, 72mm filter thread, and 0.8 MOD gears, plus coatings that produce a smooth vintage look. Ideal for indie filmmakers on a budget who need a consistent, characterful prime set for Canon EF-mount cameras.