Popocatepetl from Same Point of View, Thirty Miles Distant—Telephoto Lens.
Although some of the detail is lost in half-tone reproduction, yet the vast difference between the ordinary photograph and the telephotograph is well shown. The telegraph wires and the other details which are not visible in the former are clearly brought out in the latter. The exposure with the ordinary lens was about one-thirtieth of a second, while that with the attachment was one-fourth of a second. One-fourth of a second may seem to be a very short period of time, but it is entirely too long for many subjects that are very desirable.
St. Mark's Cathedral, Venice.
Left Mosaic of the Cathedral, Venice, from Piazza at a Distance of More than 200 Feet—Telephoto Lens.
The shortest exposure I have ever made with the attachment was upon a very fruitful specimen of the cocoanut-tree on the island of St. Kitts, one of the emerald gems of the Lesser Antilles, belonging to Great Britain. After making an instantaneous picture in the ordinary way, I used the attachment on the cocoanuts, making use of a drop-shutter giving an exposure of about one-tenth of a second. As the tree was swaying with the strong trade-wind a very quick exposure was necessary, and thanks to the intense light the plate responded to the application of a powerful developer [p. [464]].