The Canon EF 24-105mm f/4L IS II USM is a sharper & altogether better upgrade

ByMatthew Richardspublished 2 March 22


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(Image credit: Canon) (opens in new tab)

Top of the agenda for the Mark II was a redesigned optical path, which also gains high-tech ‘Air Sphere Coating’ for keeping ghosting and flare khổng lồ a minimum. Keep-clean fluorine coatings are added to the front và rear elements, và the build-quality has been enhanced for greater resistance khổng lồ vibration & shock. The image stabilizer is also improved, rising from 2.5-stop to 4-stop effectiveness, also adding automatic panning detection. As you’d expect from an L-series lens, it comes complete with weather-seals & a hood.Naturally, this lens is an f/stop slower than Canon"s EF 24-70mm f/2.8 (opens in new tab) lenses for full-frame SLRs & mirrorless bodies but gains a useful extension in telephoto reach, while also beating the Canon EF 24-105mm IS STM by an f/stop at the long kết thúc of the zoom range.

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Performance

Sharpness is better than in the original edition, especially at short khổng lồ medium zoom settings, but drops off noticeably at the long end. Bokeh remains smoother when stopping down a little, helped by the new 10-blade diaphragm. Another significant area of improvement is in barrel distortion at the short end of the zoom range, which was notoriously bad in the original edition of the lens.


Lab results

We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of chạy thử charts are taken across the range of apertures & zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations.We use Imatest SFR (spatial frequency response) charts & analysis software to plot lens resolution at the center of the image frame, corners & mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. The tests also measure distortion and màu sắc fringing (chromatic aberration).Sharpness:




(Image credit: Future) (opens in new tab)

Centre-sharpness is very good at short khổng lồ medium zoom settings but drops off noticeably at the long end, at apertures wider than f/8. Levels of edge-sharpness are good rather than entirely great throughout the zoom range.

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Fringing:



(Image credit: Future) (opens in new tab)

Color fringing can be noticeable at both the short & long ends of the zoom range but is very negligible in the mid-zoom sector.Distortion:


(Image credit: Future) (opens in new tab)

The amount of short-zoom barrel distortion is much reduced compared with the original edition of the lens, and pincushion distortion is fairly well controlled at the long end.

Verdict

There’s little khổng lồ choose between this lens và the directly competing Sigma 24-105mm f/4 DG OS HSM Art, in terms of image chất lượng and all-round performance. One major difference is that the Canon lens features weather-seals, which are lacking in the Sigma, & the Canon edges ahead for edge-sharpness. However, the Sigma is rather less expensive to lớn buy.