Photographic Objectives And Photo-Optical Auxiliary Appliances
Photographic Objectives And Photo-Optical Auxiliary Appliances
Carl Zeiss (Firm : 1846)
The book Photographic Objectives And Photo-Optical Auxiliary Appliances was written by author Carl Zeiss (Firm : 1846) Here you can read free online of Photographic Objectives And Photo-Optical Auxiliary Appliances book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photographic Objectives And Photo-Optical Auxiliary Appliances a good or bad book?
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3, having a focus of 285 mm (IIV4 in.), on a plate measuring 13X18 cm (^VsX? in.) is scarcely noticeable, even in architectural views. The Double-Protar, composed of two single lenses, is as fi-ee from distortion as any of the best existing symmetrical lenses; neither does it matter whether the combination consists of two lenses of similar or of dissi- milar focus. The combination of two lenses of similar focus possesses, however, the advantage, over those composed of two dissimilar foci, of ha...ving a larger relative aperture, hence greater rapidity. On the other hand, two dissimilar lenses provide a range of three foci, whereas two similar ones restrict the choice to two. An assortment of more than two Protar-lenses of different focus forms a Protar-Set, the elements of which can be used singly or in pairs. We supply any of these single Protar-lenses separately, having listed them under Series VII, with a view to facilitating the gradual acquisition of Double-Protars or of assorted sets of these lenses.
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