Canon EOS EOS 30D Біла книга - Сторінка 21

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Canon EOS EOS 30D Біла книга
extend during focusing, suppressing aberration variations at medium and short distances
and achieving excellent imaging performance over the entire imaging area.
In sum, wedding, portrait and sports shooters (primarily), as well as fashion photographers
and anyone else with an interest in excellent and unique optics, will find the EF 85mm
f/1.2L II USM an alluring and sophisticated tool. It is expected to retail for $2,099.
Ground aspherical lens
MTF Graph for EF 85mm f/1.2L II USM
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
(Time)
15
Although the shutter release mechanism is the same as the EOS 20D's, the EOS 30D's
Shutter Release
shutter button now allows the user to press it completely to take a picture, return it to
Mechanism
the halfway position and then press it again to take another picture. This change responds
to requests by EOS 10D and 20D users and works the same way as with EOS-1 Series
cameras and the EOS 5D. The shutter release time lag from SW-1 ON is approximately
65 ms. (stop down within 3.5 stops of the maximum aperture) and the viewfinder
blackout time is approximately 110 ms. Both are equal to or shorter than times on
the EOS 20D.
V. PERFORMANCE, DESIGN AND CONSTRUCTION
EF 85mm f/1.2L II USM
Focusing group
Aperture
0
5
10
15
20
Spatial
Maximum
f/8
frequency
aperture
10 lines/mm
10 lines/mm
10 lines/mm
30 lines/mm
30 lines/mm
30 lines/mm
AF speed comparison
EF 85mm f1.2L II USM
EF 85mm f1.2L USM
8
4
2
0.95(m)
W
EF–S 17–55mm f/2.8 IS USM
Subaperture
GMo aspheric element
Replica aspheric
E
MTF Graph for EF-S 17–55mm f/2.8 IS USM
TELE
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5
10
Spatial frequency (10 lines/mm)
Radial condition
Concentric condition
Spatial frequency (30 lines/mm)
Radial condition
Concentric condition
Circular Aperture Comparison
Max.
1.8x
AF speed!
(Subject distance)
Aperture
Corrective optics
UD element
elements
WIDE
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5
10
• The closer the blue (10 lines/mm) line is to 1,
the higher the contrast.
• The closer the black (10 lines/mm) line is to 1,
the higher the resolution.
21