Mamiya-Sekor 18cm (180mm) f/4.5 Seikosha-S Lens for TLR, Chrome Review

The Mamiya-Sekor 180mm f/4.5 Seikosha-S is a telephoto lens designed for Mamiya twin-lens reflex cameras, offering a longer focal length than the standard 80mm TLR setup. This chrome-finished lens extends the creative range of the TLR system, making it useful for portraiture and medium-distance subjects where the characteristic waist-level viewing of a TLR is still practical. With a maximum aperture of f/4.5 and a Seikosha shutter, it fits into the mid-century Japanese lens ecosystem that emphasized mechanical reliability and optical quality.

At $122 in excellent used condition (though this particular unit has a damaged front filter ring), it's a niche accessory for collectors or working shooters who already own a compatible Mamiya TLR body and want to expand their lens options. The 49mm filter thread and TLR-specific mount limit its versatility, and the damaged filter ring may complicate filter use or add cost for repair.