The American annual of photography . ing objects at different distances with approximatelyequal sharpness—is only one of the factors that go to makingup the sum total of uniformly well-rendered detail in thephotographic image. That is not saying, of course, that ultra sharpness is al-ways desirable. The pictorialist will assert emphatically thatit is not. Still, for technical, commercial, and scientific workit is often indispensable, and the average amateur, also, hasundoubtedly a fondness for it. To all such, at present contentwith a single lens or , one may give the sincere advice toborr
The American annual of photography . ing objects at different distances with approximatelyequal sharpness—is only one of the factors that go to makingup the sum total of uniformly well-rendered detail in thephotographic image. That is not saying, of course, that ultra sharpness is al-ways desirable. The pictorialist will assert emphatically thatit is not. Still, for technical, commercial, and scientific workit is often indispensable, and the average amateur, also, hasundoubtedly a fondness for it. To all such, at present contentwith a single lens or , one may give the sincere advice toborrow, if possible, an anastigmat of good make of the samefocus as their own lens, and to expose two plates on the samesubject, one with the old lens, using the largest stop, and theother with the anastigmat stopped down to the same F num-ber. There will then be little doubt left in the experimentersmind which negative has the best all-round definition, whileenlargements from the two would render the point still moreincontestable. ^o. THE ANCIENT HABITAT, ROUEN, L. A. DYAR. 221
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