This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ... field is so small in the larger sizes that they can be used only on objects which do not move and which are nearly in one plane. This confines their use almost wholly to portraiture and copying. For general photography, the greatest speed ever useful is/4.5. Lenses of this speed may be used very successfully on hand ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ... field is so small in the larger sizes that they can be used only on objects which do not move and which are nearly in one plane. This confines their use almost wholly to portraiture and copying. For general photography, the greatest speed ever useful is/4.5. Lenses of this speed may be used very successfully on hand cameras in miniature sizes. Above 3 X 4i they should be used only on reflecting cameras or those provided with a focusing screen, and for general photography 5 X 7 is the useful limit of size with this speed. With a 63 X 83 plate, /:5.6 is about the limit, while /:6 to /:6.3 marks the practical speed for 8 X 10. Of course, in portraiture, photo-engraving, etc., /4.5 lenses up to a focal length of 24 inches are often used. For the photography of rapidly moving objects and for general work in bad lights the /4.5 anastigmats are indispensable, but the lack of depth of field and consequent difficulty of focusing render the use of the full aperture inadvisable except in case of necessity, and so lenses working at /:6.3 and /:6.8, usually spoken of as " universal " lenses, are to be preferred for general photographic work where excessive speed is not needed. Focus.--Other things being equal, the most pleasing angle of view for probably 90 per cent of all amateur photographs is that obtained when the equivalent focus of the lens is equal to the diagonal of the plate. Most makers list anastigmats of shorter focus than this for each plate, for instance 6 inches instead of 6 inches for 4 X 5, 7 inches instead of 8$ inches for 5X7, and so on. In such a case it is often better to select the next size larger. A greater focal length is of advantage from a pictorial standpoint, hence the popularity of symmetrical and convertible anastigmats, the hal...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
