Announced in february 2012, the Canon 24-70mm ƒ/2.8L II USM is an update to its in style 24-70mm L-glass lens. The lens is totally redesigned, employing a combination of UD and Super UD glass parts additionally to aspheric parts. The lens was designed to suit the 35mm frame, and can additionally work on APS-C or APS-H camera bodies: on the previous, the lens can produce a good field of read of 38-112mm, whereas on the latter, the lens can manufacture a good field of read of 31-91mm. The lens options a continuing ƒ/2.8 aperture. The lens ships with a petal-shaped lens hood, takes 82mm filters, and is offered currently for around $2,400.
The Canon 24-70mm ƒ/2.8L II USM is one in all the sharpest lenses Canon has created. whereas it’s criticized by some for not incorporating image stabilization, its omission permits Canon to provide terribly sharp results that are usually uncommon in an exceedingly camera lens.
Mounted on the APS-C Canon 7D, the lens produces pictures that square measure tack-sharp at ƒ/2.8 between the 24mm and 50mm focal lengths. At 70mm, there’s a small quantity of corner softness, however it’s terribly slight so. After that, it’s all variations on an issue, which theme is extreme sharpness. there is no real impact on sharpness till diffraction limiting sets in at ƒ/11, and it is a terribly slight hit on sharpness from corner to corner. At ƒ/16 there’s slightly a lot of vital impact; at ƒ/22 it’s as unhealthy because it gets, and it’s still quite smart, even fully stopped-down.
Obviously on a sub-frame camera the corners of the lens don’t seem to be examined by the sensor, thus it isn’t stunning that we see slightly worse performance within the corners with the lens mounted on the full-frame Canon 1Ds mkIII. Performance continues to be superb once used at the ƒ/2.8 setting; from 24mm to 70mm, we have a tendency to see a pointy central region with some corner softness in every focal distance. The lens ne’er shows the tack-sharp results it will once mounted on a sub-frame camera, however the corners are solely slightly soft. once diffraction limiting sets in at ƒ/11, it additionally serves to equalize the corners with the middle of the frame: the middle is not as sharp, however the corners are not as soft. Again, performance at ƒ/16 is marginally less sharp than seen at ƒ/11, and at ƒ/22, the results area unit solely moderately sharp.
The Canon 24-70mm ƒ/2.8L II USM keeps aberration o.k. underneath control: there’s solely a small quantity of magenta-green fringing on areas of high distinction within the extreme corners.
Mounted on the sub-frame Canon 7D, corner shading isn’t a problem at any focal distance or aperture. On the full-frame Canon 1Ds mkIII but, the lens creates pictures with corners that are considerably darker than the middle. within the worst case, 24mm at ƒ/2.8, the intense corners are nearly one 1/3 work unit darker than the middle. alternative focal lengths at ƒ/2.8 show corners that are darker to the tune of 3/4 to one work unit. Stopping all the way down to ƒ/4 improves this dramatically, however, the sole settings you’ll use which can guarantee you’ve got no corner shading square measure to use 35mm or longer, and an aperture of ƒ/5.6 or smaller.
Our testing for distortion shows an advanced pattern with a degree of near-zero distortion. Used wider than 35mm, we tend to note some typical barrel distortion, not too much within the corners (+0.5% on the 7D, +0.7% on the 1Ds). At 35mm it’s still slightly barrel-distorted, however quite as regards to zero. on top of 35mm central distortion stays within the realm of barrel distortion, however quite low, whereas corner distortion becomes the cushion selection (-0.2% on the 7D, and -0.5% on the 1Ds, worst at the 70mm setting). All in all, these are not massive numbers, and correctable in post-processing computer code.
With its USM (ultra-sonic motor) designation, it does not get a lot of quieter and quicker once focusing the 24-70mm ƒ/2.8L II lens. Going from eternity to close-focus takes well but one second, and point-to-point focusing is lightning fast. Focusing results is adjusted at any time by simply turning the main target ring, and focusing operations don’t rotate hooked up 82mm filters.
The 24-70mm ƒ/2.8L II USM includes a rated close-focusing distance of 38cm (1.25 feet), however this is not a lens you’d generally use for macro work. The magnification rating is zero.21x.
Build Quality and Handling
As AN L-class lens, Canon does not spare a lot of within the manner of expense to confirm that these lenses keep going and going. The 24-70mm ƒ/2.8L II USM is weather- and waterproof, using many rubber seal seals. Its construction is primarily metal, weighing in at a chunky 805 grams (28.4 oz).
There area unit many changes enforced within the II version of this lens. as well as the following:
- Filter size exaggerated from 77mm to 82mm
- Aperture currently created of nine recurved diaphragm blades, rather than eight straight, to enhance bokeh performance
- Lens designed with eighteen components in 13 teams, as well as one Super UD and a pair of UD components; modified from sixteen elements in 13 teams, as well as three asperical
- components and one UD part
- Weight decrease from 950g to 805g
- Price increase from $1,500 to $2,400
There area unit solely 2 switches on the lens: one switch to change or disable optical device on the lens (“AF / MF”), and a second switch to lock the zoom to the 24mm setting. A window provides distance data in feet and meters: there’s no depth-of-field scale, ANd neither is there an infrared index. The focusing ring is kind of massive, composed of rubber with tiny ribs regarding an in. wide. The ring provides wonderful manual focusing fidelity, with a rather swish resistance and lots of travel. The ring ends in soft stops on each ends of the focusing spectrum, and can focus past eternity.
The zoom ring consists of rubber with massive ribs, also regarding an in. wide. The ring takes regarding ninety degrees of turning action to travel from 24mm to 70mm, and again, the ring is very swish, firm however not too tight; it needs 2 fingers to maneuver. Zoom creep wasn’t a drag with the lens we tend to tested. there’s some lens extension once the lens is zoomed dead set 70mm; the lens grows by upwards of an in.. The EW-88C lens hood is petal-shaped, attaches via a bayonet mount, and adds regarding one 1/4 inches to the general length of the lens. the inside of the hood is flocked to scale back any stray lightweight, and there is a protection mechanism to stay the hood hooked up to the lens.
There’s not a lot of to feature that the take a look at results do not already show: Canon has created dramatic improvements to the current lens series, that is certain to become the darling of Canon wedding shooters round the globe. the worth tag is considerably steep, however there area unit enough enhancements over the previous lens to over justify the worth.