photo:canonef11-24mml
Canon EF 11-24mm f/4L USM
introduction
specs
11-24mm full frame rectilinear zoom giving coverage as wide as 126º diagonal field of view (117.17º horizontal and 95.0º vertical)
f/4
9 circular blades
close focus 0.28m at 24mm (0.32m at 11mm)
16 elements in 11 groups inc 2x CaF2, 1x SUD, 1x UD and 4x aspherical elements
polycarbonate build
rear slot in gelatin filters
weathersealed
SWC and Air Sphere coatings
1180g (2.6lb)
108x132mm
$US2999
reviews
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for the first time in Canon history we can get 18-pointed sunstars
a magnificent lens.
not only is it the world's widest lens, it's also super-sharp and reasonably free from distortion
other ultra-ultra wide lenses are not this sharp
BUT poor quality lens cap and case!
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4.5% barrel distortion at 11mm, reducing to 1.8% at 14mm and neglible beyond
3.3EV vignetting at 11mm reducing down to 1.3EV at 24mm
very soft edges and corners at 11mm but best at f/8 although centre sharpness has fallen from its peak at f/4
considerable CA at 11mm but better controlled from 14mm onwards
flare is very well controlled for this type of lens
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photo/canonef11-24mml.txt · Last modified: 2017/05/06 23:43 by gary1