An Aldis 150mm f/2.8 projection lens, complete with its separate 150mm condenser lens and original fitted wooden storage case. A substantial piece of British optical equipment, suitable for collectors, optical experimentation and photographic adaptation.
The projection lens is marked "ALDIS", "150 MM", "F2.8" and "6655". It has a substantial metal barrel with a silver-coloured outer section and black finned rear section. The optical construction has not been established, and no particular lens formula is claimed.
Optical Condition
The front element exhibits noticeable deterioration of its optical coating, visible as mottling under reflected light. No internal fungus is apparent on visual inspection, although the lens has not been dismantled. The optical effects of the coating deterioration have not been assessed.
The condenser lens is supplied in its original removable black holder, marked "150 MM". Both optical components are capable of forming images independently, although their optical characteristics and intended functions differ.
Condenser Lens
The condenser originally formed part of the projector's illumination system, collecting and directing light through the transparency towards the projection lens. It is not required when adapting the 150mm f/2.8 projection lens for conventional photographic use.
Nevertheless, the condenser is an interesting optical component in its own right and may be useful for experimental imaging, illumination systems or other optical projects.
Applications
Fast vintage projection lenses are of interest to photographers experimenting with unconventional optics, particularly when adapted to mirrorless cameras using custom mounts, helicoids or bellows. Their optical characteristics can produce distinctive rendering, including unusual out-of-focus effects, flare and field curvature.
The Aldis 150mm f/2.8 may also be of interest for experimental projection, large-format photographic projects and optical demonstrations. Its suitability for any particular camera format, image circle or application has not been established.
Original Wooden Case
Supplied in its original fitted wooden case with dovetailed corner joints, metal fastening, brass hinges and Aldis identification badge. The interior has separate compartments for the projection lens and condenser assembly.
The case shows age-related wear, marks and discolouration, as illustrated in the photographs.
General Notes
This is vintage optical equipment offered primarily for experimentation, adaptation or collection. It is not a conventional interchangeable camera lens and has no standard camera mount or built-in focusing mechanism.
Please study the photographs carefully, particularly those showing the optical surfaces, as they form an important part of the condition description.
