© = Excellent focusing
(§) = Acceptable focusing
The split-image rangefinder, microprism or cross-hair area is dim. Focus on the surrounding matte area.
O = Acceptable focusing
Slight vignetting (or moire phenomenon, in the case of the microprism) affects the screen image. The image on the film, however, shows no trace of this.
Blank means inapplicable.
Note: The Teleconverters TC-301, TC-300, TC-14B and TC-14 cannot be attached to this lens.
VARIABLE APERTURE
As the lens is zoomed out from 35mm to 135mm, the maximum aperture goes down by approximately two-thirds of an f/stop, from 3.5 to 4.5. The two aperture indexes engraved on the chrome mounting ring indicate the difference: the green index is for use at the 35mm setting, while the brown one is for the 135mm set- ting. For intermediate focal length settings, align the aperture ring between the two indexes. The relationship between the focal length and the maximum aperture is shown in Diagram 1. When the zoom lens is used with cameras with through- the-lens (TTL) metering, you need not worry about adjusting the aperture, How- ever, when an independent exposure meter is used, slight adjustment is required, as in Diagram 1.
Diagram 1 | 4.5 | | | |
| | | (f/4) | |
c | 3.5 | (1/3.8) | |
| | |
IZJ | ; | | | |
(0 | | | | |
2 | | | | |
| 35 | 50 | 70 | 135 |
| | | — Focal Length | |
FLASH PHOTOGRAPHY
Follow the instructions below when you take pictures with the speedtight unit because the maximum aperture of this lens varies according to the focal length set.
•In TTL automatic flash photography (when using the SB-18, SB-17, SB- 16AJBorSB-15)
No adjustment is required because the variation in aperture is automatically accounted for. However, when the flash-to-subjecl distance is close to either the near or far limit of the auto shooting range corresponding to your working aperture, the working aperture may have to be changed as you zoom in or out.
