Stewartry

Stewartry

Year Founded: Unknown

Stewartry was a Scottish photographic accessory and lens-mount brand associated with G.B. Montgomery Manufacturing Co. Ltd. of Glasgow, Scotland. The name appears on rare post-war photographic accessories and lens mounts, most notably on the Stewartry Trinol Anastigmat 105mm f/3.5 in Leica screw mount. Unlike major optical manufacturers such as Leitz, Taylor, Taylor & Hobson, Ross, or Dallmeyer, Stewartry is best understood as a specialist engineering and mounting operation rather than a full optical manufacturer.

For LeicaLensList, Stewartry is relevant because of its rare Leica screw mount, LTM, and L39 rangefinder-coupled lens mounts. The most important known example is the National Optical Co. Trinol Anastigmat 105mm f/3.5, a British triplet lens mounted by Stewartry in a Leica-compatible screw mount. These lenses are often marked Stewartry and Made in Scotland, while the optical unit itself is associated with the National Optical Company of Leicester, England.

History

Founding / Early Years

The exact founding year of Stewartry as a photographic brand has not been reliably verified. Available collector evidence connects the name to G.B. Montgomery Manufacturing Co. Ltd. of Glasgow, a Scottish engineering business that produced photographic accessories and lens mounts in the years after the Second World War.

The word “Stewartry” refers to a district under the jurisdiction of a steward, and is also historically connected to the Stewartry of Kirkcudbright in Scotland. As a photographic brand, however, Stewartry appears to have been used commercially on post-war camera accessories rather than as the name of a large camera manufacturer.

Post-War Photographic Accessories

Stewartry is known mainly through rare rangefinder accessories and lens mounts. Surviving examples include shoe-mounted multi-frame viewfinders for rangefinder cameras and lens barrels or focusing mounts marked Stewartry Made in Scotland. These products suggest a small-scale specialist manufacturer serving photographers who used Leica, Contax, Exakta, or similar interchangeable-lens systems.

The company’s work was practical and mechanical. Stewartry appears to have manufactured or assembled mounts and accessories, while optical cells were sourced from other British lens makers. This makes the brand historically interesting because it represents a lesser-known part of the post-war British and Scottish photographic industry.

National Optical Co. and the Trinol Lens

The most important Stewartry-related Leica lens is the Trinol Anastigmat 105mm f/3.5. The optical unit was made by National Optical Co. Ltd. of Leicester, England, a company connected in collector literature with the Taylor, Taylor & Hobson optical manufacturing environment. The Trinol name is commonly interpreted as referring to a triplet design from National Optical.

Stewartry mounted these optical units for camera systems including Leica screw mount and possibly other mounts such as Exakta. Leica L39 examples are rangefinder-coupled and appear in auction and dealer records as non-Leica lenses for Leica screw mount cameras. Some examples are engraved Stewartry on the barrel and Made in Scotland, while the lens head itself may carry National Optical markings.

Collector Rediscovery

Stewartry remained obscure for decades and is not well represented in mainstream camera histories. Interest in the brand has grown mainly through collectors of unusual Leica screw mount lenses, British optics, and post-war rangefinder accessories. The Stewartry Trinol 105mm f/3.5 is now recognized as one of the rarer non-Leitz Leica screw mount telephoto lenses, especially because of its unusual Scottish mounting origin.

Product Lines

Leica Screw Mount Lenses

The primary LeicaLensList-relevant product is the Stewartry Trinol Anastigmat 105mm f/3.5 in Leica L39 screw mount. This lens uses a National Optical Co. optical cell in a Stewartry-made or Stewartry-branded mount. Known examples are rangefinder-coupled and suitable for Leica screw mount cameras, with adaptation to Leica M possible through standard LTM-to-M adapters.

Rangefinder Viewfinders

Stewartry produced shoe-mounted rangefinder viewfinders, including multi-frame or adjustable accessory finders for focal lengths used on Leica and similar cameras. These accessories are rare and help confirm Stewartry’s role as a maker of practical rangefinder equipment rather than only lens barrels.

Lens Mounting and Mechanical Adaptation

Stewartry appears to have mounted optical units from other British makers into camera-specific mounts. This role is important because the brand name may appear on the mechanical mount rather than the optical design itself. Surviving examples suggest Stewartry worked with lens cells from National Optical and possibly other British optical suppliers.

Non-Leica Mount Lenses

Collector records mention Stewartry-mounted lenses in other rangefinder or camera mounts, including Contax and Exakta-related examples. These should not automatically be treated as Leica-compatible. For LeicaLensList, only confirmed Leica screw mount or Leica M-compatible examples should be listed.

Technical Characteristics

Feature Description
Company Type Scottish photographic accessory, engineering, and lens-mount brand.
Associated Company G.B. Montgomery Manufacturing Co. Ltd., Glasgow, Scotland.
Historic Base Glasgow, Scotland.
Main Products Lens mounts, rangefinder accessories, viewfinders, and mounted third-party optical units.
LeicaLensList Relevance Rare Leica screw mount and L39 rangefinder-coupled lenses, especially the Trinol Anastigmat 105mm f/3.5.
Known Leica-Compatible Lens Stewartry Trinol Anastigmat 105mm f/3.5 L39.
Optical Supplier National Optical Co. Ltd., Leicester, England, for the Trinol 105mm f/3.5 lens head.
Mount Type Leica screw mount, LTM, L39 on confirmed examples.
Rangefinder Coupling Confirmed on documented Trinol 105mm f/3.5 L39 examples.
Optical Design Triplet design on the Trinol Anastigmat 105mm f/3.5.
Markings Often marked Stewartry and Made in Scotland on the mount or barrel.
Collector Status Rare, obscure, and mainly known among Leica screw mount and British lens collectors.

Market Reception

Stewartry is a highly obscure make, but it has strong niche appeal among collectors of unusual Leica screw mount lenses, British photographic optics, and post-war rangefinder accessories. The brand is not widely known outside specialist collecting circles, and its documentation is limited compared with larger manufacturers.

The Stewartry Trinol Anastigmat 105mm f/3.5 L39 is the key collector lens. It is valued less for mainstream optical fame and more for its rarity, rangefinder-coupled Leica screw mount construction, Scottish-made barrel, and connection to National Optical Co. of Leicester. Its rendering is generally discussed as typical of a simple post-war triplet telephoto lens, with vintage character rather than modern high-correction performance.

For LeicaLensList, Stewartry should be included as a valid make because confirmed L39 rangefinder-coupled examples exist. However, entries should clearly distinguish between the Stewartry mount and the National Optical Co. lens head. This distinction is important for accuracy, because Stewartry appears to have been responsible mainly for the mechanical mounting and accessory work rather than the optical formula itself.

Sources

Lenses (1)

Filters 1 results
Make Model Price Focal Length Aperture Release year Diameter (mm) Length (mm) Weight (g) Min focus distance Elements Groups Filter diameter (mm) MountModel number(s)Actions
StewartryTrinol Anastigmat 105mm f/3.5€4331053.51947————33—LTM—