Ultra-Achromatic Takumar 85mm f4.5
Sitting on a near contemporary black Spotmatic SPII camera.
The Ultra Achromatic is a very rare lens, dating to around 1968. The elements are made of a combination of fluorite and crystal ("quartz fluorite"), rather than glass. It has 5 elements in 5 separate groups, with no cemented elements, as the materials used to cement elements together would reduce the lens’s effectiveness.
The use of uncoated quartz fluorite elements was designed to improve the transmission of ultraviolet rays as well as visible rays; reduce colour dispersion and minimise chromatic aberrations...all characteristics that are important to scientists using ultraviolet and infrared photography.
Many thanks to Dr Jonathan Crowther, who owns this lens.
Ultra-Achromatic Takumar 85mm f4.5
Sitting on a near contemporary black Spotmatic SPII camera.
The Ultra Achromatic is a very rare lens, dating to around 1968. The elements are made of a combination of fluorite and crystal ("quartz fluorite"), rather than glass. It has 5 elements in 5 separate groups, with no cemented elements, as the materials used to cement elements together would reduce the lens’s effectiveness.
The use of uncoated quartz fluorite elements was designed to improve the transmission of ultraviolet rays as well as visible rays; reduce colour dispersion and minimise chromatic aberrations...all characteristics that are important to scientists using ultraviolet and infrared photography.
Many thanks to Dr Jonathan Crowther, who owns this lens.