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Sigma 10-20mm F4-5.6 EX DC HSM

Review Date: Apr 19, 2007 Recommend? yes | Price paid: $467.24 | Rating: 9 

Pros: Very nice and well built super-wide/wide angle lens. Delivers sharp photos throughout the photo section. Fair price for the quality.
Front cap was pretty loose sitting on the lens. Luckily I had an older Sigma lens with the same outer lens diameter which had a cap perfectly fitting onto the new lens and vice versa.

It is my favorite lens for landscape and sometimes indoor photography. With the Rebel XT D-SLR camera it leads to a focal length between 16 and 32mm. At 16mm, the picture section is huge! At the borders straight lines of objects will be bent a bit, unavoidable at the super-wide focal lengths of this type of lenses. I recommend using the freeware program "ShiftN" to get rid of bent lines when revising the photos on the PC.
The autofocus is working fine, too. Normally I use a medium to higher f-number with this lens. But even at smaller f-numbers the photo was sharp in the center and the borders.

Some people reported decentered copies of this lens. To test your copy, I recommend mounting the camera onto a tripod in front of a brick wall. The borders of the picture should be as sharp as the center at different apertures and focal lengths.

Canon EF 24-70mm f/2.8L USM

Review Date: Apr 19, 2007 Recommend? yes | Price paid: $1,154.00 | Rating: 10 

Pros: Well built lens. Constant max. aperture f2.8 between 24-70mm. Fast autofocus. Excellent optical quality. Very good color reproduction and nearly perfect contrast.

I bought this lens as addition to my Canon 100-400mm L lens and the Sigma 10-20mm lens. Since I use a D-SLR with a crop factor of 1.6, the efficient focal length of this lens is 38-112mm. It is a fast lens, nicely applicable for some close-up and portrait photographies. The autofocus with a silent USM drive is fast and reliable. The front lens does not move when focusing. It also allows to manually change the focus in the AF mode.
Since I already have a Sigma 10-20mm lens it did not matter to me that this Canon lens provides only a relatively small wide angle range on my Rebel XT.
This lens is heavy, but I prefer better to have an excellent buit quality with metal instead of plastic frames.


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