Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . 214 Wilsons quarter century in photography. shutter answers admirably. Of course, it is not recommended for instan-taneous exposures with lightningplates. of the objective has the advantage over the margins. The shutter opens in the centre,the aperture enlarges toward the margins until it has reached its highest possible exten-sion, when it is shut all at once again from the margins, so that in case the aperture ofthe shutter is not larger than the objective, it
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . 214 Wilsons quarter century in photography. shutter answers admirably. Of course, it is not recommended for instan-taneous exposures with lightningplates. of the objective has the advantage over the margins. The shutter opens in the centre,the aperture enlarges toward the margins until it has reached its highest possible exten-sion, when it is shut all at once again from the margins, so that in case the aperture ofthe shutter is not larger than the objective, it may be said that the time of exposure ofthe margins of an objective is almost too short to count at all. As in consequence of theintroduction of highly sensitive plates instantaneous shutters come more and more intouse, these indications are of special interest for practical men.—Dr. H. W. Vogel. Lenses, such as are used for instantaneous landscape work, are almost all fitted withdiaphragms, which slide into the body of the tube between the two lenses. I believe thissystem is known as the Waterhouse diaphragm (see Fig. 222,
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