Sigma’s popular tele-macro lens sees the addition of optical stabilisation and new lens coatings. Mat Gallagher discovers just how good this new version really is
The depth of field produced by macro lenses is always very shallow, especially with a longer focal length such as the 150mm. Even with a mid-aperture and a longer focal length, the fall-off in sharpness is pronounced but very pleasant. This makes it a great close portrait lens, too, at least for full-frame sensors.
On cameras with APS-C-sized sensors the 225mm+ equivalent field of view is a fairly serious focal length, but arguably even better for those easily spooked garden insects.
There is no doubting the sharpness of this lens, as it reproduces a stunning level of detail that is otherwise difficult to see by eye.
The sharpness, although good throughout, peaks between f/8 and f/16, with little loss as you open the lens up fully – so long as you get your focusing spot on. As the aperture reaches its minimum, the sharpness drops a little more and is best kept to a minimum of f/16 or an effective f/32.
Image: The lens is handy for close portraits, as it gives really pleasant defocused backgrounds