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340 AMATEUR MOVIE MAKING
It is often possible to find nests with young birds in them so situated that our meter will indicate an aperture of f 8 or f 11. Assuming that such a nest is discovered and the meter reading is f 8, we may safely set the diaphragm at f 4.5 and proceed to make slow motion film of the mother bird alighting upon a branch near the nest and feeding the youngsters. There are few films which will rival this in beauty and in interest.
This brings up another subject, one which will not be attempted by many of my readers, but one which is unrivalled in intense interest and to the student of abstract motion a truly beautiful subject. This subject is a serpent striking at its prey. I trust that an explanation of this is not due my naturalist readers, but for the casual reader may the writer digress a moment? From his own experience he can say that the loathing felt toward the serpent tribe may be quickly and easily overcome and that when this is accomplished there are few wild creatures more fascinating. With the exception of the very few poisonous snakes, there is no living creature more harmless than the serpent, regardless of the vicious attitude displayed in its attempts at self defence. Even the much dreaded "Spreading viper" (American) is capable of inflicting less harm than a two weeks old kitten. Serpents are the most easily tamed of all wild creatures although rarely becoming truly domesticated. A snake, such as the large Indigo Snake of the Southeast, when it becomes accustomed to being handled will provide material for several reels of film.
Snake Photography. — Work with snakes involves two distinct fields. Work with poisonous snakes should by all means be left to the experienced herpetologist who knows and respects the danger of the work. Such work should be done with a lens of from four to six inch focus, allowing a respectful distance to be maintained between reptile and camera. Work with the harmless varieties may be done with any suitable lens.
Slow Motion. — Slow motion work with such subjects offers unlimited opportunities and innumerable difficulties. Usually the serpent and its prey are confined together in a cage, but this is inimical to good photography. In