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Updated: May 20, 2025
Yet she used a Dallmeyer lens of only one and a half inches aperture. Her success accorded perfectly with Professor Wadsworth's conclusion that effectiveness in delineation by slight contrasts of luminosity varies inversely with aperture. Triple-coated plates, and a comparatively long exposure of twenty seconds, contributed to a result unlikely, for some time, to be surpassed.
Turn to the trades, and see if there are any lens-makers down." "Yes, sir, several," said Tom, after a short search. "Read 'em down, boy." Tom obeyed alphabetically till he came to D, and he had got as far as Dallmeyer when his visitor stopped him. "That will do," he said. "That's the man I want. Address?" Tom read this out, and the visitor said "Good; but write it down so that I don't forget.
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