Photographic Objectives And Photo-Optical Auxiliary Appliances

Carl Zeiss

• Editorial: Taylor Press
• Año: 2020
• ISBN:
  9781528763134
• Categoría: Art
• Categoría: Photography Equipment

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

Series II^a.

PROTAR 1:8

Reg^d. under German Patent No. 56109.

The Protar 1:8 possesses a relative aperture of 1:8 and a field of 75°. On account of its particularly good spherical correction it can be strongly recommended for photographing plane objects, at comparatively wide apertures, with extreme sharpness.

Of the various sizes of objectives specified in the annexed table those with foci of 110 and 136 mm (4 1/4 and 5 3/8 in.) have been extensively adopted for hand cameras, covering plates from 6 X 9 to 9 X 12 cm (2 3/8 X 3 1/2 to 3 1/2 X 4 3/4 in.). They are also largely used for preparing stereoscopic views.

Objectives with f = 205 mm (8 in.), covering plates 13 X 18 cm (5 1/8 X 7 in.), or those with f = 295 mm (11 1/2 in.), plates 18 X 24 cm (7 X 9 1/2 in.), are generally in favour for stand cameras so as to be equipped with a suitable outfit for instantaneous photography as well as for the taking of groups and landscape views.

The lenses f = 350 and 433 mm (13 3/4 and 17 in.), shown on the list as Nos. 7 and 8, are adapted for large groups, portraits and reproductions up to dimensions of 40 X 50 cm (15 3/4 X 19 l/2 in.).

The smaller sizes of this series are suitable for enlargements (not greater than 6 X) and projections. The selection must be governed by the size of the original and the dimensions of the enlarging apparatus available.

For the preparation of stereoscopic views and similar purposes pairs of objectives of strictly similar focus, and requiring the same camera extension and the same amount of stopping, are supplied to order, at an extra cost of 3.— $ per pair.

Street-scene, Paris.

PROTAR 1:8

in Standard Mount with Iris-Diaphragm.

For Hand Cameras with fixed extension and focal plane shutter working in front of the sensitive plate we recommend

PROTAR 1:8

in Special Mount A with

Iris-Diaphragm

and Focusing Attachment.

When ordering by wire it is sufficient to quote the Code-word.

By “Extension” is understood the distance of the sharp image from the face of the camera front when focused for very distant objects.

Series III^a.

PROTAR 1:9.

Patented at home and abroad.

Reg^d No. 41715 — 1899.

These objectives have an anastigmatically flat field; their angle is about 97⁰, and the aperture of the objective is 1:9.

Protar 1:9 is therefore an instantaneous and, at the same time, a wide-angle lens.

The smaller objectives of this series are particularly well adapted for stereoscopic and hand cameras. They are also much appreciated as wide-angle lenses for landscapes, interiors and architectural views.

As a suitable outfit for hand cameras we would suggest the following:

Size of Plate	Focus of Lens
6 × 9 cm (2 3/8 × 3 1/2 in.)	95 mm (3 3/4 in.)
9 × 12 cm (3 1/2 × 4 3/4 in.)	120 or 150 mm (4 3/4 or 6 in.)
13 × 18 cm (5 1/8 × 7 in.)	172 or 196 mm (6 3/4 or 7 3/4 in.).

For Stand Cameras we recommend:

Size of Plate	Focus of Lens
13 × 18 cm (5 1/8 × 7 in.)	172 or 196 mm ( 6 3/4 or 7 3/4 in.)
18 × 24 cm (7 × 9 1/2 in.)	272 or 317 mm (10 3/4 or 12 5/8 in.).

The larger lenses of Series III^a are eminently suitable for large portraits, large groups, and reproductions.

Our pamphlet „Anleitung und Tabellen“, which we shall be glad to supply gratis and postfree, may be a welcome guide to both amateur and professional photographers in the selection of suitable lenses and will, in m...