The Age of Salt. Art, Science and Early Photography, James Hyman, 16 Savile Row, London W1, until 31st March 2015

Roger Fenton
Woods at Bolton Abbey, 1856-1860

This exhibition traces the early days of photography through both technical and artistic development. Some of the earlier works, such as the Roger Fenton shown here, reflect paintings of the period.

Etienne-Jules Marey
Analyse de la marche et de la course Station Physiologique

There are salt prints from Italy, France and the United Kingdom combined with examples of the emerging techniques such as collodion on glass, albumen printing and the differing forms of photomechanical engraving.

http://www.jameshymangallery.com

FOOTNOTE:
There is also the exhibition Salt and Silver: Early Photography 1840-1860 at Tate Britain (until 25th May) which includes some of the rarest and seldom publicly shown examples of these early photographs. They show both historic and daily scenes from the mid-19th century.

tate.org.uk