Posts Tagged ‘Bokeh’
This is to see which of the lenses produce a better bokeh effect. Wikipedia describes it as:-
“In photography, bokeh is the blur, or the aesthetic quality of the blur, in out-of-focus areas of an image, or “the way the lens renders out-of-focus points of light.” Differences in and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting—”good” and “bad” bokeh, respectively.”
These images are higher res for your viewing pleasure.
From what I can see, the Sigma lens gives a more rounded and far pleasing effect with the out of focus lights. I’m looking for another copy of the 24-70 Canon lens as I want to do some portraits with both lenses. At the moment I prefer the Sigma lens.
None of these images have been edited other than the normal processing into jpegs from the original raw files.
What you will notice is a slight shift with what each lens can see. They are both set to 24mm but as far as I can tell, the differing lens designs capture two different amounts of space. This is because the Canon lens zooms out in order to capture the 24mm focal length and the Sigma zooms out at the 70mm. I neglected to include the 70mm for both lenses because the difference is even more pronounced. I’m sure this can be corrected but it’s probably beyond my time and patience.
Included below are some crops from the images above. From the centre and the middle showing centre sharpness and edge sharpness.
You can clearly see the Canon lens is without a doubt sharper in the centre of the lens than the Sigma at f2.8. At f22 it looks like the Sigma catches up some what but the Canon lens still bests it. You don’t even need to see it in the closeups, the thumbnails actually illustrate the differences.
It’s going to be difficult here to make a true comparison because both lenses capture fractionally different pictures (again lens design dictates this as mentioned previously). I also shouldn’t crop one lens to fit the frame of the other. Otherwise it wouldn’t be a fair comparison since one of them won’t have been cropped from the edge of the frame.
For example, the details on the left side of the images (arched lines) for the Sigma are on the right side for the Canon crops. Of course the area captured by Sigma looks sharper but that isn’t as near to the edge is it? Anyway, the Canon lens I think is still sharper on all counts. But the Vignetting is more pronounced, producing darker edges at 24mm than the Sigma.
- Part One (Introduction)
- Part Two (Lenses and Test Info)
- Part Three (Olympus 17.5-45mm Kit lens)
- Part Four (Olympus 12-60mm Zuiko lens)
- Part Five (Panasonic/Leica 25mm lens)
- Part Six (Minimum focusing distance)
- Part Seven (Panasonic/Leica 25mm lens – DOF, Sharpness)
- Part Eight (Panasonic/Leica 25mm lens – aperture comparison images, f1.4 & f2)
- Part Nine (Conclusion)