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