canonrumors reviewed Canon’s long awaited EF 600mm f/4L IS II. Impressions are very good. From the verdict:
On the surface, Canon has produced the best designed 600mm lens in their history and maybe ever. The weight savings alone are a monumental achievement. Everything else about the lens is high end, from optical performance to autofocus and build quality.
There are sample images provided. The EF 600mm f/4L IS II has a price tag of $12,999 and can be pre-ordered at the following shops:
Japanese site egami (Google translated) spotted two new Canon patents. The patents refer to the EF 600mm f/4 and the EF 400mm f/2.8 lenses. The lenses will have reduced size and weight. The 600mm will have 15 elements in 9 groups, the 400mm 14 elements in 9 groups (more specs below). Performance charts:
More specifications (machine-translated)…:
Patent Publication No. 2012-88427
2012.5.10 Release Date
2010.10.18 filing date
Example 1
Focal length f = 585.00mm
Fno 4.12
Image height 21.64mm
Length 468.50mm lens
BF 90.78mm
15 sheets of 9 group lens configuration
One aspherical surface a
2 UD glass sheet
One fluorite
A plane diffraction
Example 2
Focal length f = 391.86mm
Fno 2.88
Image height 21.64mm
Length 367.51mm lens
BF 50.01mm
Lens Construction 14 elements in 9 groups sheet
2 2 aspherical surface
1 UD glass sheet
One fluorite
A plane diffraction
Group 3 consists of positive and negative positive
Inner Focus (group 2)
Strengthen the refractive power of the front lens group, and to shorten the overall length, the sensitivity is increased, it is difficult to manufacture and assembly
The number of lens group at the end of the super-telephoto lens is determined by the balance of the total length and chromatic aberration
And shorten the length and reconcile, the correction of chromatic aberration, the number will increase
It is important to the length of each degree
Weight of the first lens group, 70% to 9 on the whole
Canon patents is reduced to three the first group
Aspherical and one eye in group 1 group, field curvature correction, the distortion
Diffractive optical element and the second two groups in the first group, the chromatic aberration correction
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