This section is from the "Naturalistic Photography For Students Of The Art" book, by P. H. Emerson. Also see Amazon: Naturalistic Photography For Students Of The Art.
The student will of course remember that his camera must be square in order to have a reversing frame fitted, but that makes no difference to the dark slides. Having then fixed on the size of his camera, a question requiring the greatest thought, he must next tell the maker the length of bellows he requires, which is usually measured from front to back when the camera is racked out to its full length. As we recommend the use of long-focus lenses only, as will be seen in the chapter on lenses, and as no definite law can be laid down for this length, it is advisable to order a camera four or five inches longer than the focal length of the lens which is advertised to cover the next larger-sized plate to that which your dark slide holds.
And now for a caution against a fallacy still current in photographic circles, which is that one size of plate is more suitable for pictorial purposes than another. Let no such nonsense influence you, the size of the plate has nothing whatever to do with success or beauty. Every composition will demand its own particular size and shape, and though you work with a ten by eight inch camera or any other size, you will find you will often take a nine by four inch or a ten by three inch plate or a dozen other sizes and cut off all the rest. All fanciful rules for fixing on the size of a plate for pictorial reasons cannot be too strongly condemned. Such things must be left to the individuality of each artist, and every picture-gallery in Europe gives the lie to all rules for a choice of size. The artist, must of course, suit his canvas or plate to his subject, not his subject to his canvas or plate.
For studio, or indoor work, the camera may of course be heavier for obvious reasons, and a different form of support is necessary, the one usually adopted being very convenient for lowering or raising the lens so that the best point of sight is obtained according to the position of the model. It seems to us, however, that these studio cameras and stands are made a great deal too heavy and cumbersome. For this kind of work a very necessary part of the apparatus is a hood of some dark material fixed on to the front of the camera and extending above and beyond the lens, in order to obviate the effect of the numerous reflections always present in a glass studio. Out of doors this is only necessary when the sun is shining into the lens; otherwise it is never needed, for we have tried it, and have proved that its use has in no way improved either the truth or the artistic quality of the negative. In cases where the sun shines into the lens a hat, a piece of cardboard, a folded newspaper, or anything of the kind, will answer the purpose equally well.
 
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