Lens reviews update: test data for the Sigma 24-105mm f/4 DG OS HSM
DxOMark has just reviewed the Sigma 24-105mm f/4 DG OS HSM, a general-purpose zoom for full frame SLRs. As part of our ongoing collaboration we've added the test data to our lens widget, and looked to see how it compares to the Canon equivalent. We've also added test data for the Nikon mount version of Zeiss's stellar Apo Sonnar T* 2/135.
Also this week, DxOMark has published its sensor analysis for the Nikon Df (confirming that its imaging performance is the same as the top-of-the-line D4), and the Sony Alpha 7. It's also produced lens recommendations for the Micro Four Thirds Panasonic Lumix DMC-GX7 and Nikon's entry-level SLR, the D3200. Click here for a full round-up of DxOMark's recent reviews.
Sigma 24-105mm f/4 DC OS HSM | Art lens test data
Here we're showing DxOmark's lens test data for the Canon-mount version of the Sigma 24-105mm f/4 DC OS HSM on both the full frame EOS 5D Mark III and the APS-C EOS 7D, along with a quick summary of the main findings. We're also showing a quick comparison to its Canon equivalent, the EF 24-105mm f/4L IS USM.
Click on any of the images or links below to open our interactive lens widget, and explore the data further
1) Tested on Canon EOS 5D Mark III
The Sigma 24-105mm F4 is designed to be used on full frame cameras, on which it offers an extremely useful wideangle to short telephoto zoom range. It's a pretty impressive performer too, producing excellent sharpness right across the frame wide open at all focal lengths. Indeed there's barely any change in measured sharpness between F4 and F11.
Chromatic aberration is a bit high - there's some obvious blue/yellow fringing at wideangle, and red/cyan at telephoto. Vignetting is also quite strong, with a precipitous drop-off in brightness towards the corners of the frame at either end of the zoom range when shooting at F4; however it clears up on stopping down to F5.6. Distortion is also quite pronounced, with 2.7% barrel at 24mm, and 2.4% pincushion from 70mm to 105mm. But to be fair, none of this is really any worse that we'd expect from a 4x zoom on full frame.
2) Tested on Canon EOS 7D
On APS-C cameras like the EOS 7D, the lens offers a zoom range equivalent to 38-168mm on full frame, which isn't necessarily an obvious choice for general-purpose use. However the 24-105mm still performs pretty well in terms of sharpness, giving very good results across the frame at almost all settings. It's weakest wide open at telephoto, but improves markedly on stopping down to F5.6.
Chromatic aberration is a little high, especially at wideangle where blue/yellow ringing is likely to be very visible towards the edges and corners of the frame. There's also some red/cyan fringing at the tele end. However, as usual for a full frame lens used on APS-C, distortion and vignetting are both pretty low, with just a little barrel distortion at wideangle.
3) Compared to the Canon EF 24-105mm f/4L IS USM
The main rival for the 24-105mm f/4 DG OS HSM in Canon mount is the similarly-specified EF 24-105mm f/4L IS USM, which was announced back in 2005 alongside the original EOS 5D. Here we're comparing the two on full frame.
The test data shows that the Sigma and Canon have rather similar characteristics. The Sigma edges out its older rival for wide open sharpness towards the long end, although any visible difference is likely to disappear at F5.6. It also has a bit less barrel distortion at wideangle. Against this, the Sigma shows more pronounced vignetting at telephoto. The biggest difference in these tests is transmission: despite the same f/4 maximum aperture, the Sigma passes about half a stop more light.
Zeiss Apo Sonnar T* 2/135 (Nikon mount) test data
Hot on the heels of the breathtaking Zeiss Otus 1.4/55, we've also added test data for the Zeiss Apo Sonnar T* 135mm F2. It's basically much the same story again - the 135mm is a spectacular performer.
There's simply nothing to criticise here at all. Sharpness is excellent wide open, and phenomenal at F4. Chromatic aberration and distortion are both negligible, and vignetting nothing to worry about either. Zeiss lenses aren't remotely cheap, but you get what you pay for.
Our lens test data is produced in collaboration with DxOMark. Click the links below to read DxOMark's own review of the Zeiss Otus 1.4/55, or see other recent reviews on the DxOMark website.
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|.....the ROYAL LOTUS 2017/08/25-NEW YORK..... by Chiwat|
from Wild flowers
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from Another cup of coffee
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