The J.H. Dallmeyer Brass Lantern Projection Lens is an early projection optic housed in a brass barrel, made by the long-established London optical firm founded in the Victorian era. Designed for use with magic lanterns, it was intended to project glass slides rather than to capture images, and it sits in the antique-projection category rather than alongside Dallmeyer's better-known photographic lenses.

Sales evidence is thin: the only recorded UK auction hammer result is £160 in June 2022, which sets both the known high and low and gives a single-point median of £160 at saleroom level. Because that figure is a wholesale auction result rather than a retail asking price, dealer-listed examples in 2026 are likely to sell for more, and condition of the brasswork and glass remains the main driver of what any individual example is worth today.