The test lab DxOMark released their findings today on the Sigma 24-105mm f4 lens. Overall, they seem to give it a lot of praise. But where it’s really taking the championship is with the comparisons. As a former professional photographer that relied heavily on his 24-105mm f4 L IS, I can say with experience that I used to send it in for calibration a couple of times a year. Sigma’s option seems to be a killer one though.
What’s even more astonishing is the T rating. The Canon lens is rated at T5.1 while Sigma is at T4.2. That translates into a heck of a lot more light. For the unknowing, a T stop rating is the exact light transmission rating, while an F stop is only really an approximation–at least that’s the simple way of putting it. However, Canon’s Chromatic Aberration seems better controlled.
In real life, it’s still the photographer that creates the images and having a vision for the final result is key. But it can also affect your workflow, histograms, etc. It really just means a bit more brightening with Canon’s lens than you normally would on top of more sharpening.
The lens is only slightly beaten by Nikon’s version, and that could be because it was tested on a D800.
Then when you consider the more affordable price of the Sigma 24-105mm f4 lens, then it becomes an even more attractive option. We’re working on our Sigma 24-105mm f4 review now, so stay tuned for our findings.