The Kodak Salesman . astigmatlenses did not come into popularuse — the high price whicli theirmore complex and accurate struc-ture compelled the manufacturersto ask. Improvements in canuras andmaterials had been made very rap-idly and with them prices well with-in the reach of the average amateurhad been maintained; but the pricesof anastigmats r e m a i n e d it is possible to make mostexcellent photographs w i t h thecheaper lenses, such as the singleachromats and rapid rectilinears,the firm conviction established it-self that only with the general useof anastigmats of the best qu
The Kodak Salesman . astigmatlenses did not come into popularuse — the high price whicli theirmore complex and accurate struc-ture compelled the manufacturersto ask. Improvements in canuras andmaterials had been made very rap-idly and with them prices well with-in the reach of the average amateurhad been maintained; but the pricesof anastigmats r e m a i n e d it is possible to make mostexcellent photographs w i t h thecheaper lenses, such as the singleachromats and rapid rectilinears,the firm conviction established it-self that only with the general useof anastigmats of the best qualitywould the level of the photogra])hicresults obtained by amateurs beraised to keep pace with the moreand more rapid betterment of thephotographic supplies ofitered onthe market. It was this conviction,backed by the progressive spiritwhich has always animated thename Kodak, that made it possibleto accomplish the apparently almostimpossible task of producing anas-tigmat lenses of the verv highest ^ KODAK SALESMAN. Fig. 1. (jualiiy at a vcr_\- niuderate the goal has been reached i>vouched for to-day by thousands ofusers of Kodak Anastigmats. fromthe Government down to the hum-blest amateur. In order that youmay understand how the dream ofthe Kodak Anastigmat became areality and how the solution of cer-tain problems in connection withthe production of lenses for usein aerial photographs durii-g thegreat war was a potent factor inmaking it available to the photo-graphic public at such reasonableprices, it will l)e necessar\- to con-sider the difficulties of design andmanufacture that had to be over-come. As a basis for our (li>cu->ion weshall review briefly the concepts offocal length and relative apertureor speed. When a photographerfocuses the image of a distant ob- ject on his ground glass, plate orfllm. the focal length of the lens is,roughly speaking, equal to the dis-tance from the sharply focusedimage to the diaphragm of the is not an exac
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Keywords: ., bookcentury1900, bookdecade1910, bookidkodaksalesma, bookyear1917
