[. . . ] As this unit is a true wideangle lens, it reproduces straight lines accurately and without the pronounced curvature effects common to fisheye lenses. Also, the optics are corrected for evenness of illumination across the full frame, and employ the Nikon close focus correction system (the rear elements are "floating") for optimum performance at the 0. [. . . ] Recommended Focusing Screens Various interchangeable focusing screens are available for F2 and F3 Nikon cameras to suit any type of lens or picture-taking situation. Camera Screen —_^^ A / L B C D E Gl G2 G3 G4 Ht H2 H3 H4 J K/P M R T F3 F2 • • © © 0 © -1 o o © © -y> © © m m © • © • When the Teleconverter TC-200 is attached to this lens, use the follow ing table: c i S r — - _ f f [ « " A / L B c D E Gl G2 G3 G4 HI H2 H3 H4 J K/P M R T F3 F2 m© • © © © • • m • • • • ©= Excellent focusing • = Acceptable focusing The split-image rangefinder, microprism or cross-hair area is dim. 0 = Acceptable focusing Slight vignetting (or moire phenomenon in the case of the microprism) affects the screen image. Note: Light transmission properties vary somewhat with focusing screen type, thus occasionally requiring exposure correction to compensate for the combined effects of the lens/screen/camera combination in use. The numbers listed in certain columns of the combination table above (i. , —1 and — H) denote the amount of correction necessary in f/stops. To adjust the camera's Photomic finder for the indicated f/stop correction, lift and turn the film-speed index ring until the ASA/ISO value for the film in use is aligned with the appropriate mark engraved on the ring. In the example figure shown, ASA/ISO 100 is aligned with the —'/2 mark to provide the correction required when using the Type H2 screen with a Photomic finder-equipped F2 Nikon camera and mounted Nikkor 13mm f/5. LENS USE • Due to the unique optical construction and wide picture angle of the Nikkor 13mm f/5. The photographer should check that all unwanted or distracting elements (e. [. . . ] Remarque: La transmission de la lumiere varie legerement suivant le type de verre de visee employe et peut done necessiter une correction pour compenser I'effet de la combinaison objectif-verre de visee-boftier. No reproduction in any form of this booklet, in whole or in part (except for brief quotation in critical articles or reviews), may be made w i t h o u t written authorization from the publishers. [. . . ]