Overview
True Lens Services (TLS) is not a single device or lamp, but a British specialist in lens technology based in Barwell, Leicestershire. The company is internationally known for three areas of activity: the rehousing of vintage photo and cinema lenses into robust, cinema-ready mounts, the servicing and repair of film, broadcast, and projection lenses, and the in-house manufacturing of proprietary optics (including their own Vega series).
The core of their offering is to preserve the optical character of vintage lenses while bringing them mechanically up to the standard of modern cinema production: precise focus pull, standardized gear rings, uniform front diameters, and production-ready mounts.
Rehousing Process
During rehousing, the original optics are transferred into a newly manufactured housing made of high-quality aluminum alloy and stainless steel. According to TLS, the components are manufactured in-house, with the exception of bearings. The mechanical focal points are:
- Focus Mechanics: A non-linear, cam-driven design with nearly 300 degrees of rotation, which distributes focus markings more evenly than the narrow original scale of photographic lenses.
- Backlash Elimination: A sprung follower with chamfered flanks eliminates backlash and image shift during focus pulls.
- Stops: Stainless steel stops for focus and aperture.
- Standardization: Uniform gear ring positions for focus and aperture relative to the mount flange, ensuring compatibility with follow focus and motor systems.
Typical Product Range
TLS rehousess classic cinema lenses for cinema use as well as photographic optics. Examples from their range:
| Category | Examples |
|---|
| Classic Cinema Lenses | Cooke Speed Panchro, Bausch & Lomb Super Baltar, Kowa Cine Prominar, Lomo Anamorphic |
| Photo/Still Lenses (Cinema Converted) | Canon K35, Canon FD, Leica R, Zeiss Contax/Super Speed, Nikon AI/AI-S, Olympus OM, Petzval, Mamiya 645 |
Typical standardized features: PL and LPL mounts with flange focal distance adjustable via shims, front diameters mostly 110 mm (special lenses sometimes 125 or 143 mm).
On-Set Usage
For the camera department, a TLS rehousing means that an optically appealing vintage lens with its characteristic "look" is preserved, but can be operated like a modern cinema lens: long, repeatable focus pull, uniform gear rings for motors and follow focus, consistent front diameter for matte boxes, and a robust PL/LPL mount. TLS conversions are commonly found in rental houses as sets; well-known references include the Cooke Speed Panchro conversion for Mr. Turner and the use of re-housed Petzval optics in Poor Things.