Review: Sigma 10-20 F3.5 EX DC
Objavljeno dne 02 October 2009
On Slo-Foto.net we present you test of lens Sigma 10-20 F3.5 EX DC, reviewed by Peter Bernik.
"This time we present you an exclusive test of a new ultra width Sigma lens. It is a faster "sibling" of the earlier implementation of 10-20 mm lens, which is time across the spectrum of fixed f3.5 aperture (instead of f4-5.6)."
Review has been translated with Google Translator.
This time we present you an exclusive test of a new ultra width Sigma lens. It is a faster "sibling" of the earlier implementation of 10-20 mm lens, which is time across the spectrum of fixed f3.5 aperture (instead of f4-5.6). Lens we have with its rise of greater dimensions (diameter filter with 82 mm) to know that their lenses on the sensor transmit more light and thus enable us, or at least facilitate photography in low light conditions, as well as more reliable and faster focus .
In view of buildings on the outside, except a little bigger dimensions and weight, remains the same. So rugged housing, as we mark EX guaranteed, the ring is going to go changing focal lengths, one for manual focus, it is somewhat "harder". As to the "inside" can be observed that the number of lenses to reduce from 14 to 13 and increase the number of Aperture blades from 6 to 7, which is of course always welcome (perhaps the "UWA" lenses not so important because here but "bokeh" in practice there is no expression). Focusing is fast and silent thanks to the HSM construct, while the focus Home of course, so as to allow the use of circular polarizing filters. Minimum focusing distance is 24 cm. I was surprised that the increment of weight only 55 g (at the expense of fixed f3.5 aperture), then 10% good, also the external rates.
The major part of the test have carried out on a trip to Barcelona. The lens is very suitable for this purpose, because practically never happens (in fact that never happened to me), something that would not have covered the scene. So far that is what I've missed no various trips (even in cities such as Venice). I photographed almost exclusively with this lens, I shot some photos with a normal lens (details). After few days you get so used to a wide angle and covers that they appear to be normal or medium telephoto lenses abnormally narrow and strange indeed (of course, is in fact the reverse). Usefulness does not end here, is essential when shooting certain sports (skateboarding, roller skating, snowboarding, "downhill" ...), various events (concerts club, party-i ...) and interesting for the portraits, which surely visit harvested salve laughter . After the optical lens quality comparable to the previous implementation. As far as sharpness is only in the center of this image is already in the open aperture for ultralight lens, very good sharpness in the corners and 10 mm in beet. Sharpness is by closing the shutter, of course, is improving. Vignetting is (again, for this type of lens) is negligible, but chromatic aberration is quite pronounced, at 10 mm is also visible in the aperture f10.
3. Specimens - Terrain
Photo bellow is a good example of the usefulness ultra width lens. By 10 mm, I just have to catch even a cathedral, otherwise it would have been shot in the palm trees that grow in the park opposite the church. Because fish perspective distortion is of course very strong, but our objective at least to the possibility of covering the entire design without disturbing elements. To try to minimize distortions designs include the central perspective (ie an angle of 90 °). For better understanding see the other (central perspective) and a third file (fish perspective).
An example of the usefulness larger aperture. The motif here easily accounted for, because we allow shorter shutter times with the same ISO value and is not necessary to increase the ISO setting and thus may avoid the higher level of noise in the picture. Of course, the focus is quickly and reliably.
Even more useful the larger aperture of 20 mm, where the lens from the previous version (f4-5.6) "faster" for which 1 1 / 3 shutter. These photos of the old version simply would not have covered the ground that despite the increase in the value of the ISO 3200, shutter time got only 1 / 15 and the photo would probably have been stress.
In conclusion, followed by still photographs of the original size to assess sharpness at 10 mm on the individual parts. As you can see it in the center of quite useful in open aperture, f4 is the sharpness of the ultra already good at F5.6 is excellent. The edges are in the open aperture quite soft, but by closing the shutter things corrected. Earlier, I mentioned quite highly chromatic aberration (edge of the cathedral), and here it is clearly visible.
5. Plus and minus