. Bird lore . ulb and tube will work with certainty at long range, and it is impossibleto tell whether an automatic shutter has been released or not. If this is to be the only camera used, it should be fitted with a focal-plane shutteralso, which is an absolute necessity for photographing flying birds, as this requiresan exposure of from one four-hundredth to one eight-hundredth of a second,according to the speed at which the birds wings are moving. More fully ex-posed plates can be obtained at high speed with the focal-plane shutter thanwith any other, because the lens is always wide open, no
. Bird lore . ulb and tube will work with certainty at long range, and it is impossibleto tell whether an automatic shutter has been released or not. If this is to be the only camera used, it should be fitted with a focal-plane shutteralso, which is an absolute necessity for photographing flying birds, as this requiresan exposure of from one four-hundredth to one eight-hundredth of a second,according to the speed at which the birds wings are moving. More fully ex-posed plates can be obtained at high speed with the focal-plane shutter thanwith any other, because the lens is always wide open, no time being lost inopening and closing the shutter, and because the adjustable slit in the curtaintraverses from top to bottom of the plate, exposing all portions of the plateuniformly. In order to use this camera for tree work, special apparatus is neededfor attaching the camera to the trunk or branches. I have a little device con-sisting of a brass base which can be fastened to the tree by an ordinary shawl-. SHORT-FOCUS, REFLECTING, AND LONG-FOCUS Strap; the camera is then secured to the base by a double ball-and-socket joint,also of brass, one member of which screws into the base and one into the camera,thus enabling the camera to be pointed in any direction. This ball-and-socketjoint can also be used conveniently in the tripod top for pointing the cameradownward or upward without adjusting the legs. The whole apparatus foldsup compactly with the tripod, the shawl-strap serving as a handle. Another 104 Bird-Lore tree ajjparatus, which some photographers prefer, consist of an L-shaped pieceof iron with a gimlet point at one end, which is screwed into the tree, the camerabeing attached to the other end by a ball-and-socket bicycle clamp. This hasthe advantage of being somewhat firmer, but it is not so good for use on smallbranches or bushes. When supplied with such a camera as this, the beginner would be fairlywell equipped for all-round work at bird photography, and
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, booksubjectorn
