SLR Gear has testes an interesting macro lens from Sigma. The lens is called Sigma 28mm f/1.8 EX DG Aspherical Macro and is able to photograph at a very wide aperture.

SLR Gear ends up giving the a good review especially if you are using the lens on full frame DSLR camera. The lens does not offer the best sharpness and corner shading wide open, but it is better when used on a full frame camera.

Read the full review of the Sigma 28mm f/1.8 EX DG Aspherical Macro lens here.

Photography Blog has tested the Sigma DP1s. This compact digital camera from Sigma has a big 14 megapixel Foveon image sensor so it seems that Sigma has created a compact that takes image quality serious. But now that Panasonic and Olympus has released their Micro Four Thirds camera is seems Sigma has got it tougher. Let us hear what the reviewer thinks about the DP1s.

Some key features for the Sigma DP1s camera:
-14.06 megapixel Foveon X3 sensor
-28mm f/4 prime lens
-2.5″ LCD screen
-RAW format support
-External hotshoe

Photography Blog ends up giving the Sigma DP1s an “Above average” rating with 3.5 out of 5 stars. The Sigma camera scores highest on image quality while scoring lower on value, features, ease of use and design. It is able to take pictures of excellent quality, but the camera lacks all the features you can get with Micro Four Thirds camera and on top of that it is quite expensive. The DP1s still seems like an interesting camera if you want the unique Foveon quality on your pictures.
Read the full review of the Sigma DP1s compact digital camera here.

SLR Gear has reviewed the Sigma 24-70mm f/2.8 IF EX DG HSM AF lens. This standard zoom lens has a constant large aperture across the zoom range making it more interesting than other standard zooms with varying aperture. But the constant aperture comes at a price since the Sigma lens got a $900 price tag. Will the hefty price be worth it?

SLR Gear find the Sigma 24-70mm f/2.8 IF EX DG HSM AF to be pretty good, especially on cameras with smaller sensors than full frame cameras as you get quite a bit of vignetting on full frame. Wide open you get quite a bit of corner softness and chromatic aberrations, but if you stop it down it performs better. If you need sharp pictures at f/2.8 you might want to look at a more expensive lens, but if that is not so important for you you should consider this Sigma lens.
Read the full review of the Sigma 24-70mm f/2.8 IF EX DG HSM AF lens here.

SLR Gear has reviewed the super wide Sigma 10-20mm f/3.5 EX DC HSM lens. With its constant f/3.5 this Sigma lens seems to be interesting for people who like to do wide angle photography. It remains to be seen what the reviewer thinks about the lens.

SLR Gear ends up giving the Sigma 10-20mm f/3.5 EX DC HSM a very good review as the lens is able to take very sharp pictures especially at the wide end (where it counts). There is a bit of chromatic aberration, but there is less vignetting and corner shading than in the previous version of this Sigma lens.
Read the full review of the Sigma 10-20mm f/3.5 EX DC HSM lens here.

Photography Blog has reviewed the Foveon camera Sigma DP2.

Some key features for the Sigma DP2:
-14 megapixel Foveon sensor
-2.5″ LCD screen
-41mm f/2.8 lens
-ISO sensitivity from 50 to 1600
-weight 260 grams

Photography Blog ends up giving the Sigma DP2 a “Recommended” rating as the camera is able to take pictures of very good quality. The DP2 also scores high on design and ease of use, but it does not get the highest score because there are other cameras out there that give the Sigma DP2 a lot of competition. Examples of these cameras are the Micro Four Thirds cameras from Panasonic and Olympus.
Kudos to Sigma for taking a chance and producing a compact camera where image quality is in focus.
Read the full review of the Sigma DP2 camera here.

Sigma has updated the Photo Pro software to version 3.5.2 for Windows and version 3.3 for Mac that is used for editing images. The update improve processing of highlight areas in RAW files and adds the “ProPhotoRGB” color space. In the Windows version Sigma has added exposure warning for RGB channels in the histogram.

For the DP2 version you can get the latest version of Sigma Photo Pro here.

For the DP1 version you can get the latest version of Sigma Photo Pro here.

For the DSLR (SD9, SD10 and SD14) version you can get the latest version of Sigma Photo Pro here.

Sigma has released new firmware for their Sigma DP2 compact camera with a large Foveon sensor. Firmware version 1.02 improves the autofocus and makes it possible to access magnified live view with a button press in manual focus mode.

Some key features for the Sigma DP2:
-14 megapixel Foveon sensor
-2.5″ LCD screen
-41mm f/2.8 lens
-ISO sensitivity from 50 to 1600
-weight 260 grams

You can download and read more about the new firmware at the Sigma website.

Lets Go Digital has done a field test with Sigma 150mm f/2.8 EX DG HSM Macro lens on a full frame camera body. The test was done with a Canon EOS 5D Mark 2 full frame camera. This Sigma lens is available for many different mounts including Canon, Nikon, Four Thirds (Olympus and Panasonic) and Sigma mounts. I have considered buying this lens for my Olympus E-500 DSLR as I love macro photography so it will be interesting to see what the reviewer thinks about the lens.

Lets Go Digital ends up giving the Sigma 150mm f/2.8 EX DG HSM Macro lens a very good review as the lens takes very sharp pictures, especially from aperture 4. The auto focus is pretty fast, but it produces a bit of vignetting on a full frame camera.
Seems like an excellent macro lens if you need to long range to capture skittish bugs.
Read the full review of the Sigma 150mm f/2.8 EX DG HSM Macro here.

SLR Gear has tested the Sigma 50-500mm f/4-6.3 EX DG HSM APO RF lens (also known as Bigma). This lens has an impressive zoom range that fit the needs of birders and wildlife photographers so it is interesting to see how the picture quality is at the long end of the zoom. The Sigma 50-500mm is available for many different camera mounts including Canon, Nikon, Four-Thirds, Sigma, Pentax and Sony.

SLR Gear gives the Sigma 50-500mm f/4-6.3 EX DG HSM APO RF lens an ok review as the lens is not the sharpest lens they have ever tested, but what can you expect with such a big zoom range. At some focal ranges and apertures you can get pretty good results. Chromatic aberrations and distortion is also well controlled.
Overall this ultrazoom lens from Sigma seems interesting if you need a big zoom range for birding and wildlife photography.
Read the full review of the Sigma 50-500mm f/4-6.3 EX DG HSM APO RF lens here.

Dpreview has posted some interesting sample pictures taken with the Sigma DP2 Foveon camera. They have tested ISO sensitivities from 100 to 800, and also tested different color modes and pictures of different subjects.

Some key features for the Sigma DP2:
-14 megapixel Foveon sensor
-2.5″ LCD screen
-41mm f/2.8 lens
-ISO sensitivity from 50 to 1600
-weight 260 grams

Check out the sample pictures that Dpreview has taken with the Sigma DP2 here.