Sigma EX Macro Lens Metal Digital Camera Lenses
June 16, 2009 | Component, Digital Camera, Gadgets | 1 CommentSigma offers no less than 5 macro lenses that are suitable for all APS-C format and the full frame sensor. The focal length is 50, 70, 105, 150 and 180 mm. The brightness of the Sigma f/2.8 lenses in all cases except one. It is only 180 mm lens, which offers a brightness of f/3.5. Given the size 35 mm, the focal length of 50, 70 and 105 mm are very short for a macro. You’re so close to your subject that features cast a shadow on it. More importantly, at the focal length of 150 and 180 that you are held at a distance of the object.
If you have a camera with APS-C a factor of 1.5 times the culture at your disposal, the focal length of 150 and 180 are rather large for a macro due to the risk of blur caused by jitter. Since I work with a full body, the 150mm f/2.8 is more practical than the 180 mm f / 3.5, or at least on paper. After all, the objective is 150 mm shorter, lighter, brighter and even much less! Not a macro Sigma has a stabilization system for avoiding blur caused by jitter.
The matte black finish of this macro lens immediately reveals that it is the most expensive range Sigma EX. The frame is metal and it is very solid. The rubber coating of the focus ring provides a comfortable grip, and fortunately, a large sun visor with a bayonet is included. Also included is the standard rotating tripod table, the table which is almost big enough. If you want to get rid of a certain weight, this Sigma macro lens weighs almost a pound more than the Sigma 105mm f/2.8 macro, you can easily remove the table of the lens.
The characteristics Sigma HSM Autofocus silent. The autofocus is fast, but not as fast as for example the Canon L lenses. However, if you compare the speed of the Nikkor 180mm f/2.8, you will find the Sigma AF work much faster. In general, the circumstances, the Sigma 150mm f/2.8 rarely hunting if it is used in combination with the Canon 5D Mark 2. If this happens, you can choose to pay the “excess”. This limits the AF range of 52cm to infinity or from 38 to 52cm. When doing macro work, I almost always the target in the manual mode. This is easy using the switch on the lens. The manual rotation of 38cm to infinity is 270 degrees. It’s more than enough to be able to manually focus with extreme precision. AF Canon 5D Mark 2 could be adjusted by the lens. The problem of front and back focus focus has become a thing of the past. However, with my test, I did not do so.
All sorts of opinions on the ideal focal length for portrait photography is underway around, as is the case of macro photography. For a full-frame, the 85 or 90 mm is considered the most perfect lens for portraits. However, I can not find enough for a cropped picture. Usually, I work with a 100mm f/2.0 in the studio. There are times when I would have a little more at my disposal mm. This leads to a 135mm or 70-200mm zoom. I do not run in a studio environment with one of these great 70-200mm/2.8 “trumpets”. Sigma 150mm/2.8 has a much smaller appearance and the ability to focus will also be closely in practice for example, “bodyscape ‘, another branch of fashion photography. I really like the focal length of 150mm for the work in the studio. A studio that is only illuminated by the light flashes, is slightly on the dark side, but the AF of the Canon 5D Mark 2 was able to do its job quite well, in combination with the Sigma 150mm f / 2.8.
One of the disadvantages of a full frame camera, is that many suffer heavy lens vignetting at maximum aperture. And Sigma 150mm f/2.8 is unfortunately no exception. I measured, 2 no vignetting at the opening of 2.8 and the distance set at infinity. This seems stubborn vignetting, even at 11.0, I run in the remains of it. However, this is negligible in practice. If you set the camera at a distance, vignetting becomes much less important. Telephoto lenses are known for their low distortion. The new Sigma 150mm f/2.8 is not an exception, while the distortion is not visible in practice.
The more than 20 million pixels of the Canon 5D Mark 2 only benefit when combined with a lens that is clear and precise. At the opening of the center 2.8 can be used without apparent problem is that photos taken in practice. Opening stage of a high quality in the center of the sharpness. Even the edges are not disappointing. When editing the files, I noticed that having to refine the files less than usual. The quality of the final print will certainly benefit. For a macro, it is extremely important that the intentional vagueness, for example, before or in the background is rendered with a fine mist and appropriate. Also in this area, the Sigma 150mm f/2.8 scores very well. [ via letsgodigital ]
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