Overview

The Sun 24mm f/2.5 MC is an M42 wide-angle lens with mixed reviews. Wide open at f/2.8, it appears soft (iangreenhalgh1), but may improve when stopped down. Build is typical for its era, though the auto-aperture mechanism requires modification or a flanged adapter for manual use, with compatibility issues noted for Pentax (Riku). It suits budget-conscious photographers seeking a vintage wide-angle, but optical performance is considered poor compared to peers (iangreenhalgh1).