Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED User Manual download pdf (Page 23)

Close working distance

At the high reproduction ratios used in close-up shooting, the depth of field

is very shallow. To ensure greater depth of field, stop down the lens, then

carefully position the camera to ensure the most important surface of the

subject is in the same zone of sharp focus.

•Use manual focus when using the close-up lens.

7. Exposure factor

The f-number of a lens indicates brightness of the image formed by the lens

set at “infinity” shooting distance. The higher the reproduction ratio is, the

more the brightness of the image will decrease. The actual brightness of the

image is called the “effective f-number,” and the exposure compensation

value for the change of the effective f-number is called the "exposure

factor.”

8. Effective f-number variation (P. 124)

With this lens, the higher the reproduction ratio is, the more the brightness

of the image on the film (image sensing device) will decrease and the

effective f-number will increase (the amount of light that comes through the

lens’ aperture will decrease). This variation is automatically compensated for

by the camera’s exposure meter, so the user can determine exposure or

operate TTL flash shooting without having to consider the exposure factor.

The f-number displayed in the camera’s LCD panel or viewfinder is the value

automatically compensated.

Focused distance

(cm/inch)

No. 5T 1/6.3–1.22 15.0 × 22.5–1.97 × 2.95/ 82.4–28.1/32.4–11.1

5.9 × 8.9–0.8 × 1.2

No. 6T 1/3.3–1.44 8.0 × 12.0–1.67 × 2.5/ 49.8–26.1/19.6–10.3

3.1 × 4.7–0.7 × 1.0

No. 5T + 6T 1/2.2–1.65 5.24 × 7.86–1.45 × 2.18/ 38.1–24.3/15.0–9.6

2.1 × 3.1−0.6 × 0.9

Close-up

attachment

Reproduction

ratio

Subject field

(cm/inch)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 131 132

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Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED User Manual Page 23