Our factory methods of adjusting the focusing scale correspond closely to the foregoing paragraph. To insure accuracy, the focusing scales are placed on Kodaks by actual focusing. The camera is placed beneath a hood, which serves as a focusing cloth and cuts off all light except that entering through the lens. Incandescent lights are arranged at different distances, which correspond with the figures on the focusing scale. For instance, the camera is first focused on a light 15 feet away, regardless of the scale, which is then so placed on the camera that the 15 foot mark will come directly underneath the pointer. The scale is then fastened in position and tested at other distances, the image on the ground glass being examined with a magnifying glass. Before the camera is finally passed from his department, the inspector makes certain that the focusing scale cor responds exactly with the ground glass at each distance.
While the shutter is open and the ground glass is in position it will prove interesting and instructive to note also the etieel of the stops. After
focusing on some objeCt with the largest diaphragm, put a smaller stop in position and note the decrease in light and the increase in sharpness over the entire picture. There may be no marked increase in sharpness of the particular objeel on which you have focused, but nearer and further objets will be sharpened in a remarkable degree. Remember this point later. The above experiment with stops may also be tried with the fixed focus cameras.
Having now something of the theory of photography, you are pre pared to make your first negatives. Read carefully the instructions on the making of snap shots and time exposures given in the following pages, hav ing also read carefully the instructions for operating your camera, which are given in the manual accompanying it, you are ready to sally forth and undertake the work of exposure. We advise snap-shot work to begin with, but you should be sure to pick out for your first work a day when the light is strong and brilliant, that your first batch of negatives may be fully timed.