The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Shutters, Instantaneous
of the lens ; b, in between the lenses ; c, behind the lens ; and D, in front of the plate. To learn the action of any shutter on the light and image transmitted by a lens, the reader is advised to take a piece of card, and pass it across the diagram in the direction of the moving parts of the actual shutter ; he will thus be able to see the action of shutter he is thinking of buying. As an example, we will take the Go and Return shutter acting in front of the lens, and show it when the moving piece is halfway up fig. 117 From this it will be seen that there is considerable difference in the amount of light received by the plate. It is not a matter of in-difference whether the shutter be close to the lens or not, as will be seen from fig. 118 there being a considerable gain when it is close to the lens. With shutters open-ing from, and closing to, the centre in front of he lens, the centre of the picture, which is generally the horizon of the picture receives far more light than the margins, which include the sky and foreground, the action of such a shutter being shown in fig. *e^ When this / class of shutter acts between
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