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By the late 1930s the Taylor brothers of Taylor, Taylor & Hobson had both passed and in 1945 the renamed Taylor-Hobson became a subsidiary of the Rank organisation. In 1947 Taylor-Hobson began integrating coatings onto their lenses at the factory. The production of Speed Panchros continued during this transition and lenses with the coatings and transmission stop markings became known as the Coated Cooke Speed Panchros (Series I). Owners and rental houses had the option to send their uncoated lenses back to the factory for coatings and T-stop markings to be applied. Whilst the uncoated Speed Panchros had only gone as wide as 24mm, Taylor-Hobson had also begun using various rare earth elements in the glass compositions to obtain high refractive indices. This enabled the creation of a 18mm Speed Panchro T2.0 to expand the focal length range. The 8 lens coated set then, covered from 18mm to 100mm with most lenses achieving a wide open T stop of T2.3.

Country of Origin: England
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https://cookeoptics.com/news-and-events/the-history-of-panchro-part-1/