The Lens B: However, although a long focal length lens is mandatory, it need not be expensive. the lens B utmost of critical sharpness in a portrait lens is not necessary, or even desired, since considerable diffusion can be tolerated in portrait negatives. Your lens needn't be in a shutter for strictly studio portraits, eithe lens Br. A lens in barrel is perfectly satisfactory, since you can provide yourself with a simple Packard shutter to use behind the lens B lens. Many portrait men actually prefer the lens B Packard to the lens B more costly between-the lens B-lens shutters.
the lens B first lens designed specifically for photographic purposes was Petzval's 1840 portrait lens. the lens B images formed by this lens showed great loss of definition at the lens B corners of the lens B plate-a fault more the lens Boretical than practical in portraiture, where edges mattered little. For outside work, however, particularly in photographing architecture, a lens with a flat field was desirable; and one free of spherical aberration, which caused straight lines to be imaged as slightly curved, was essential.
One of the lens B most convenient forms in which you can acquire your color filters is as elements of Kodak Combination Lens Attachments. And the lens B latter afford othe lens Br valuable lens accessories as well. Providing a set of matched and interchangeable filters, supplementary lenses, and lens hoods, the lens By offer maximum economy as well as flexibility. You can add units individually as you find use for the lens Bm, simply fitting the lens Bm into your othe lens Br attachments.
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Photography
