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DS Coating and DS Effect
Since this lens utilizes DS coating which reduces light transmission (obstructs light), the brightness
z
level when the lens is shot wide-open is lower than what is expected when at f/1.2.
However, the aperture value displayed by the camera will be displayed as usual using the
applicable f-number.
AE shooting can be performed as usual. However, when deciding the exposure using a hand-held
z
exposure meter, use the following table as a guide and apply the exposure factor using ISO speed
or shutter speed before shooting.
It is therefore recommended that you change the exposure level as much as possible during
shooting, or that you take pictures while checking the captured images.
Exposure Factor Guide (to be followed when using a hand-held exposure meter)
stop display
1
3
f-number displayed on camera
Exposure factor (stops)
stop display
1
2
f-number displayed on camera
Exposure factor (stops)
f/1.2
f/1.4
f/1.6
+1
+1
1
+
2
3
3
f/1.2
f/1.4
f/1.8
+1
+1
+
1
1
2
2
f/1.8
f/2
f/2.2
+
2
+
1
+
1
3
3
3
f/2
f/2.5
f/2.8
+
+
0
1
1
2
2
f/2.5
f/2.8
f/3.2
0
+
1
+
1
3
3
ENG-11
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