The American annual of photography . gative;at F:8 there is an improvement; at F:i6 you have a fairlygood negative; at F132 you get an under-exposed negativeand so on to the end. All these exposures, good, bad andindifferent, should give you a clear idea of what stoppingdown really does, what relation the speed of the shutter hasto the stop employed, and a realization that as you stop downthe exposure must be increased and, conversely, as you in-crease the aperture the exposure must be shortened. If you have carefully digested a few fundamentals of lensinformation, and if you apply your knowle
The American annual of photography . gative;at F:8 there is an improvement; at F:i6 you have a fairlygood negative; at F132 you get an under-exposed negativeand so on to the end. All these exposures, good, bad andindifferent, should give you a clear idea of what stoppingdown really does, what relation the speed of the shutter hasto the stop employed, and a realization that as you stop downthe exposure must be increased and, conversely, as you in-crease the aperture the exposure must be shortened. If you have carefully digested a few fundamentals of lensinformation, and if you apply your knowledge to the negativesbefore you, there is small doubt but that you will know moreabout what your lens will or will not do than anyone experiment is by no means exhaustive, scientific or in-fallible, but, other things being equal, there is no quickermethod of obtaining a speaking acquaintance with your newlens. From this first rough experiment you may originate anynurnber of subsequent tests which you deem of value to you 24. BY THE MOUNTAIN SPRING. George Steele Seymour. in deciding upon the efficiency of your anastigniat. Individuallens requirements are legion; and it is and would be next toimpossible to advance any stated method whereby every ownerof a new lens could satisfy himself that the lens was right forhis purpose. It has always been my opinion that the acid testof a lens lies in the direct application of the lens to the workin hand. If it meets your critical requirements, why worry ifit does not test to 1/500 of an inch on a test chart? Of course, if your work happens to be photographing maps,charts and delicate technical subjects the test chart assumesgreater importance. However, if other forms of photographyinterest you and the lens does your work, let well enoughalone,—there are plenty of other matters to take up yourattention to better advantage. As in every field of human activity, photography has itscranks. This statement is not made in a disparaging
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