Lenses Camera Reviews: Sigma 28-70mm f/2.8-4 DG AF Lens for Canon EOS / EF

วันอังคารที่ 20 มกราคม พ.ศ. 2552

Sigma 28-70mm f/2.8-4 DG AF Lens for Canon EOS / EF

Sigma 28-70mm f/2.8-4 DG AF Lens for Canon EOS / EF

The Sigma 28-70mm f/2.8-4 DG zoom lens offers a large aperture of F2.8 at 28mm focal length and yet it is compact and lightweight, with an overall length of 62.5mm and weight of 255g. (9oz.). This digitally optimized diagonal fisheye lens is equipped with a new multi-layer coating technology that reduces both flare and ghosting. This compact, large aperture zoom lens is ideal for digital and 35mm SLR cameras. The size and weight of this standard lens makes it very suitable for landscape photography, and snapshots. DG is a designation Sigma uses on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras.

Product Details

Amazon Sales Rank: #6510 in Camera & Photo

Size: 58mm

Brand: Sigma

Model: Sigma-2870mm-DG-Canon

Dimensions: .54 pounds

Features

From 28mm wide to 105mm tele range this zoom lens has 50cm (19.7inches) minimum focusing distance. It has also maximum magnification of 1:6.5.

Incorporates an Aspherical lens element to minimize distortion.

As part of the DG line, this lens is optimized for digital cameras.

The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance.

A zoom hood is supplied with this lens for complete depth in the telephoto range and glare-free shooting in the wide-angle range.

Customer Reviews

Decent lens as long as you are ok with manual focus.....
This is a decent lens with a very cheap build. The auto focus is horrible on this lens. It is not a problem for me but for someone who can't use manual focus it could be a HUGE issue. When auto focus is used the image appears to be a bit soft or out of focus. If you use manual focus the image quality really improves but is still not that great.

much better
Great little lens. I am really happy with Sigma.. this is my second Sigma lens.. although it isn't quite a canon it does a great job.

You get what you pay for.
I received this lens as part of a package on eBay, along with a Canon XTi. On paper it looked to be better than the Canon kit lens.

The image quality is nice although not outstanding. The real gripe I have is that the auto focus is nearly useless. Most of the time, the focus is off just enough that the photo is too soft to be usable. (By "soft", I mean "out of focus". I know the difference between soft and short DOF.)

Occasionally (maybe 10% of the time) the AF will go into what I call "thrashing." It will get near the correct focus and then it will jitter back and forth focusing just a bit close then too far, never settling on anything. I'm looking to unload it on eBay, but I doubt I will get enough money to make it worth the effort.