{"product_id":"1950s-sei-photographic-exposure-spot-photometer","title":"1950s SEI Photographic Exposure Spot Photometer","description":"\u003ch1\u003e1950s SEI Photographic Exposure Spot Photometer\u003c\/h1\u003e\n\u003cp\u003eThis 1950s SEI Photographic Exposure Spot Photometer is a very rare piece of vintage Photographic\/Cinematographic equipment. It is being sold as a collectible, for display only, and has not been tested.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApproximate Size:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLength: 17.7 cm (excluding wires)\u003c\/li\u003e\n\u003cli\u003eDiameter: 4 cm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn good condition for its age, with a few surface blemishes, the lens is dusty and no longer totally clear. It comes with its original polystyrene box which is in fair condition with some scuffs, discolouration and scratches commensurate with age and use.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMade by Salford Electrical Instruments, (part of GEC), Peel Works, Silk Street, Salford, Lancashire, between 1948 and 1960, the instrument measures light by comparing the brightness of a subject with the brightness of the lamp inside the meter. The brightness of the subject can be assessed against that of the lamp, and correlated with the correct exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe patent mentioned on the top of the meter, \u003ca href=\"https:\/\/patents.google.com\/patent\/GB582673A\" target=\"_blank\"\u003eGB Patent 582 673\u003c\/a\u003e, dates to 1944 and was filed by George Seymour Platt.\u003c\/p\u003e\n\u003cp\u003eThe base can be removed revealing the bulb compartment which provided the light source for the photometer. It would have taken a battery but has been professionally converted to take an external electrical source. The wiring needs replacing as it has stuck to the polystyrene and part of the protective wiring sleeve is missing.\u003c\/p\u003e\n\u003cp\u003eIt measures the light in \u003cem\u003eLog Foot Lamberts, \u003c\/em\u003ea unit of luminance (brightness) more commonly used in the USA and often associated with the Motion Picture Industry. You can also set:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRelative Density \u003c\/li\u003e\n\u003cli\u003eExposure Time (secs)\u003c\/li\u003e\n\u003cli\u003eLens Aperture\u003c\/li\u003e\n\u003cli\u003eA.S.A Index\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBeautifully engineered from a chromed non-ferrous metal, the photometer is marked: \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSEL Exposure Photometer\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ci\u003eMade in England\u003c\/i\u003e\u003c\/p\u003e\n\u003cp\u003eApparently, it's not easy to use but gives such accurate readings that it is still used in some movie studios!\u003c\/p\u003e\n\u003cp\u003eHere is an original advert for the photometer (not included):-\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/SEI_Photometer_240x240.jpg?v=1617034887\" style=\"display: block; margin-left: auto; margin-right: auto;\" width=\"279\" height=\"378\"\u003e\u003c\/p\u003e\n\u003cp\u003eA great find for the vintage photography\/cinematography collector!\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003ePlease click on the following link for more \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/vintage-photographic-and-imaging-equipment-accessories\" target=\"_blank\"\u003evintage photographic and imaging equipment.\u003c\/a\u003e \u003c\/p\u003e","brand":"SEI Salford Electrical Instruments","offers":[{"title":"Default Title","offer_id":39592790065301,"sku":"","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/products\/DSC01363.jpg?v=1617034734","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/1950s-sei-photographic-exposure-spot-photometer","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}