Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED Lens - Manual (Page 23)

En
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.
23
Focused distance
(cm/inch)
No. 5T 1/6.3–1.22 15.0
Ч
22.5–1.97
Ч
2.95/ 82.4–28.1/32.4–11.1
5.9
Ч
8.9–0.8
Ч
1.2
No. 6T 1/3.3–1.44 8.0
Ч
12.0–1.67
Ч
2.5/ 49.8–26.1/19.6–10.3
3.1
Ч
4.7–0.7
Ч
1.0
No. 5T + 6T 1/2.2–1.65 5.24
Ч
7.86–1.45
Ч
2.18/ 38.1–24.3/15.0–9.6
2.1
Ч
3.1
−
0.6
Ч
0.9
Close-up
attachment Reproduction
ratio Subject field
(cm/inch)