Overview

The Cyclop T3C-2 (Helios) 100mm f/2 is a Russian lens originally from a night vision scope, with an M42 mount and no aperture control—it's fixed at f/2. Its optical performance is characterized by very pronounced field curvature, yet it can produce some really nice images. Build is utilitarian, and handling is basic. It suits photographers seeking a unique, characterful lens for creative effects, despite its limitations.