Article Index

Field Tests

The lens performed quite well across all focal lengths. Canon EF 24-105mm f/4L IS USM produced sharpest images at 24mm, with progressive degradation towards 105mm. At 105mm, the lens still produced decent results, but nothing extraordinary. Chromatic aberration was well under control. At 24mm, the lens had some minor artifacts, which were still present at 50mm and completely gone towards the telephoto range. As always, stopping down to f/5.6 or f/8 helped achieve best results.

Image stabilizer is a fantastic bonus in this lens! It works and works pretty well - the improvements are especially noticeable at the telephoto end where IS helps you gain extra 3 f-stops. Should you use this lens as a telephoto lens? The answer is - probably no, since there are better telephoto lenses out there. However, some photographers will find the extra focal length on this lens quite handy.

 

Vignetting @ f/4 - full frame vs 1.6x crop (24mm)
Vignetting @ f/4 - full frame vs 1.6x crop (24mm)

 

Vignetting @ f/4 - full frame vs 1.6x crop (105mm)
Vignetting @ f/4 - full frame vs 1.6x crop (105mm)

 

On a full-frame body, the lens produced noticeable vignetting with a wide open aperture at 24mm, which becomes practically negligible by f/5.6. Vignetting is reduced towards the longer end of the focal length, and become less of a nuisance even with wide open apertures. On an APS-C body with 1.6x crop factor, vignetting is practically non-existent throughout the entire zoom range. Color fringing was quite minor around borders and non-existent in the center. The lens held up nicely against flare and did not exhibit any noticeable distortion.

 

ISO 100, 1/1000, f/4, 24mm
ISO 100, 1/1000, f/4, 24mm