One of the highlights in Dominic Winter’s photography sale in Cirencester on March 9 is this image of Sir John Herschel taken in 1839 by Julia Margaret Cameron. Estimate £30,000-50,000.

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Two pioneers of photography are encapsulated in this famous image. It was taken in 1839 by the ambitious and important early photographer Julia Margaret Cameron (1815-79) and depicts the polymath Sir John Herschel (1792-1871).

Herschel took an active interest in photography from its earliest days, coining the term ‘photography’ and inventing the photographic use of sensitised paper among other achievements.

The 12 x 9½in (30 x 24cm) portrait is one of a series of four taken at Herschel’s home in Kent and has passed by direct descent from the sitter to the Dominic Winter photography sale in Cirencester on March 9.

Estimate £30,000-50,000.