It is easy to see why the price increases with the speed.

2. The illustration does not indicate the

greater size of a fast lens, but it does suggest the added weight.

Eastman Kodak Co., Rocheiter. N. Y.

The lens is the camera. In choosing a lens, sharp definition and good color correction are important. High speed is of value for only a few special uses. A set of lenses with different focal lengths is most advantageous.

Portable dark rooms, daylight loading developing tanks, and compact and efficient enlargers make it possible to do most photographic work in a drafting room or store room boasting hot and cold water. Opaque curtains or a wall board screen may be drawn when necessary to exclude light. Portable equipment appears in 400A.

ELEMENTS

RELATIVE

LENS

OF LENS

SPEED

MENISCUS

DOUBLET

( )

1/2

F.7.7

F.6.3

• F.4.5

«l

F.3.5

F.2.8

Ml

F.2.0

(CH

GRAPHIC PRESENTATION

^^^JE^

I -- Vorking lopa Urge eooH^ to t*ke four (4) tUndard traft.

2 -- Sptec for Irimmer, blotun, tquMigM pUlM, etc.

J -- Four (4) driwrn for paper*, filnu, Degttive*. etc.

4 -- Foldind doora 6tled with lock and key.

S -- Section for storage bottle*, chemicala, meaauring glaaa, etc.

6 -- S«fivcl caatorv.

G Grniicrt. New York. N Y.

A. Portable Darkroom.

USING a variety of photographic techniques will add interest to a record or report. Photomontage, as seen in 401 A, effectively presents much information in a small space by combining several negatives or parts of negatives in one print. Photomosaic is somewhat similar but combines several prints or portions of prints, drawings, etc., by cutting and pasting, using either photographic or other backgrounds.