Prominent London photographer the French-born Antoine Claudet was a user and active promoter of the solar camera, who lectured on the subject to the British Association in Oxford in June 1860, and in 1862 presented "On the means of following the small divisions of the scale regulating the distances and enlargement in the solar camera" at the British Association for the Advancement of Science in October. Earlier that year he exhibited a number of life-size portrait enlargements from "carte de visite" negatives at the 1862 World Fair, which were praised as 'magnificent' and 'without distortion', the reviewer noting that Claudet would have exhibited more but "for the continued absence of sunlight during the last few weeks."