RICOH SINGLEX TLS

Name: Ricoh Singlex TLS
Brand: Ricoh

The Ricoh Singlex TLS is a 35mm single-lens reflex (SLR) camera introduced in 1967 as Ricoh’s flagship M42 screw-mount SLR with through-the-lens (TTL) metering. However, it was not the first Ricoh SLR with TTL metering—earlier models like the Ricoh TLS 401 (1966) already featured stop-down TTL metering. It represented a significant advancement in Ricoh’s SLR lineup, combining professional-grade build quality with advanced exposure metering for its era.

Overview

Released in 1967, the Ricoh Singlex TLS was designed to compete with high-end SLRs from Pentax, Topcon, and Minolta during a period of rapid innovation in 35mm photography. Positioned as Ricoh’s top-tier model, it succeeded the earlier Singlex series and was notable for being one of the first Ricoh SLRs to feature TTL metering via a full-aperture CdS (cadmium sulfide) cell. The "TLS" designation stands for "Through-the-Lens," "Light metering," and "Stop-down," reflecting its dual metering capability: users could meter either at full aperture for convenience or stop down for depth-of-field preview with accurate exposure reading.

The camera targeted advanced amateur and professional photographers who required precision, reliability, and compatibility with a wide range of M42 lenses. Constructed with a die-cast metal chassis and a leatherette-covered body, the Singlex TLS offered a balanced ergonomic design with a large pentaprism viewfinder, making composition and manual focusing more accurate. It featured a vertically traveling, focal-plane cloth shutter and supported flash synchronization via PC terminals and a hot shoe. With its modular design, interchangeable viewfinder (though rarely replaced), and support for various accessories, the Singlex TLS was engineered for versatility in both studio and field environments.

Within Ricoh’s product hierarchy, the Singlex TLS stood at the pinnacle of their SLR offerings, above models like the Ricoh Singlex II and Ricoh TLS 401. It showcased Ricoh’s ambition to establish credibility in the competitive Japanese SLR market, leveraging optical expertise from their long history in lens manufacturing. (Note: The Ricoh XR series came after the Singlex TLS and was not contemporaneous.) Although Ricoh never achieved the same brand recognition as Pentax or Nikon, the Singlex TLS remains a respected model among vintage camera enthusiasts for its solid construction and advanced metering system.

Specifications

Specification	Value
Type	35mm Single-Lens Reflex (SLR)
Film Format	35mm (135 film), 24 x 36 mm image size
Years Produced	1967–1972
Lens Mount	M42 × 1 mm screw mount (Pentax Universal)
Shutter	Vertically traveling focal-plane cloth shutter; speeds from 1 sec to 1/1000 sec, plus Bulb (B)
Metering	TTL CdS metering with full-aperture and stop-down capability
Exposure Modes	Manual exposure only; stop-down metering via AE switch lever
Viewfinder	Fixed pentaprism with microprism spot and split-image rangefinder center; Approx. 0.92× magnification; approx. 97% coverage
Dimensions	145 mm (W) × 95 mm (H) × 53 mm (D); weight approx. 710 g (body only, without battery)

Key Features

TTL Full-Aperture CdS Metering: One of the first Ricoh SLRs to offer through-the-lens metering at full aperture, enabling faster and more accurate exposure readings without stopping down the lens.
Dual Metering Mode: Switchable between full-aperture metering for ease of use and stop-down metering for depth-of-field preview and accurate exposure with non-automatic lenses.
M42 Lens Compatibility: Fully supports the extensive range of M42 screw-mount lenses from Ricoh, Pentax, Fujica, Zeiss, and others, including auto and manual aperture lenses.
Precision Viewfinder: Bright pentaprism with split-image rangefinder and microprism collar for precise manual focusing, ideal for critical work.
Robust Mechanical Construction: Die-cast metal chassis with durable shutter mechanism and mechanical reliability even without battery power (shutter functions mechanically at all speeds except metering).

Historical Context

The Ricoh Singlex TLS was launched at a pivotal moment in SLR development, when TTL metering was transitioning from novelty to standard feature in mid-to-high-end cameras. Competitors like the Pentax Spotmatic (1964) had already demonstrated the appeal of full-aperture metering, and Ricoh responded with the Singlex TLS to capture a share of the growing enthusiast market. Unlike earlier Ricoh SLRs that relied on external or stop-down-only metering, the TLS integrated a CdS cell into the pentaprism housing, allowing real-time exposure readings through the lens without closing the aperture—a significant usability improvement.

Despite its technical merits, the Singlex TLS faced stiff competition. The Pentax Spotmatic series dominated the M42 market, and newer cameras from Minolta (SR-T series) and Topcon (RE series) offered similar or superior features. Ricoh’s relatively weaker brand presence in Western markets limited the TLS’s commercial success, and it was discontinued by 1972, succeeded by the Ricoh Singlex II, a simplified and more affordable model, and later the Ricoh XR series of electronic SLRs. Nevertheless, the Singlex TLS played an important role in Ricoh’s evolution, demonstrating their capability to produce sophisticated, professional-grade cameras and laying the groundwork for future collaborations with Pentax.

Collectibility & Value

Today, the Ricoh Singlex TLS is a sought-after model among collectors of vintage SLRs, particularly those interested in M42 systems or Japanese camera engineering from the 1960s. While not as widely collected as the Pentax Spotmatic F or Topcon RE, it is appreciated for its build quality, accurate metering, and ergonomic design. In excellent working condition, prices typically range from $80 to $150 USD, depending on shutter functionality, light seal integrity, and viewfinder clarity. Fully functional metering (requiring a PX625 1.35V mercury battery or modern equivalent with voltage adjustment) adds significant value.

When purchasing a Singlex TLS, buyers should inspect the shutter at all speeds (especially 1/1000 and 1 sec), check for mirror slap noise or sticking, and verify that the CdS cell responds correctly to light changes. Common issues include degraded light seals (leading to light leaks), stiff aperture levers, and fogged or delaminated viewfinder prisms. The camera uses a mercury battery (now obsolete), so users often substitute with zinc-air or alkaline batteries, though this may affect meter accuracy due to voltage differences. Adapters or meter recalibration may be necessary for precise exposure.

Similar Cameras

Pentax Spotmatic F (1973) – The benchmark M42 SLR with TTL metering, similar build and target market.
Topcon RE Super (1963–1971) – Professional-grade M42 SLR with exceptional viewfinder and build, direct competitor.
Fujica ST801 (1969) – High-quality M42 camera with TTL metering and premium finish.
Praktica PLC 3 (1976) – Later M42 SLR from East Germany with similar metering and mechanical design.
Yashica TL Electro-X (1970) – Electronically controlled M42 SLR with CdS metering, slightly later but comparable in function.

Repair & Maintenance

The Ricoh Singlex TLS uses a 1.35V PX625 mercury battery (now discontinued) for its CdS meter. Modern replacements include Wein Cell (zinc-air, 1.35V) or alkaline PX625A (1.5V), though the latter may require exposure compensation or a voltage-reducing adapter for accurate metering. The camera’s shutter and film advance are fully mechanical and do not rely on batteries, ensuring operational functionality even without power.

Common maintenance issues include sticky shutter curtains at slow speeds, worn foam light seals (should be replaced to prevent light leaks), and degraded leatherette. The meter coupling mechanism can become misaligned if lenses are forced or improperly mounted. Professional CLA (Clean, Lubricate, Adjust) services are recommended every 5–10 years for regular users. Due to its mechanical simplicity and M42 compatibility, the Singlex TLS is relatively straightforward to repair, though specialized parts may be scarce. Enthusiast forums and vintage camera technicians familiar with M42-era Ricoh models are valuable resources for restoration.