Overview

The Pentax-110 70mm f/2.8 lens, originally for the Pentax Auto 110 SLR, is popular adapted to micro four-thirds cameras due to similar sensor size. It has no aperture adjustment, fixed at f/2.8, requiring neutral density filters in bright light. Optical quality varies: a sample with reversed element produces a 'Deakinizer' effect with clear center and blurred edges, while dust can reduce image quality and prevent infinity focus. Build is solid, but handling includes vignetting. Best for experimental or creative use, not critical sharpness.