http://www.fotofach.de/ 113-261 http://www.fotofach.de/zoomobjektive-erfahrungsberichte/tamron-af-18-250mm-f35-63-di-ii-ld-aspherical-if-makro/ Early user comments already suggested that new Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] macro does not only offer a longer range but also a higher quality over the old Tamron AF 18-200mm XR and the lab results confirm these impressions. The results may not touch the sky but the new AF 18-250mm delivers a very solid performance for most of the range. Unsurprisingly the weak spot is at 250mm @ f/6.3 - stopping down to f/8 is a good idea here. Nonetheless the resolution characteristic is fairly amazing regarding the extreme zoom range. Typical for such lenses the Tamron exhibits a quite extreme level of barrel distortions at 18mm but at longer focal lengths to the problem isn't overly significant. Vignetting is a problem at 18mm f/3.5 and in critical situations you should generally stop down a bit. Lateral CAs (color shadows at the image borders) are on a medium level except at 250mm where the problem can get more disturbing. As to be expected for a zoom lens in this price league ( ]]> Thu, 01 Apr 2010 10:38:20 +0200 113-191 http://www.fotofach.de/zoomobjektive-erfahrungsberichte/tamron-af-18-250mm-f35-63-di-ii-ld-aspherical-if-makro/ Early user comments already suggested that new Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] macro does not only offer a longer range but also a higher quality over the old Tamron AF 18-200mm XR and the lab results confirm these impressions. The results may not touch the sky but the new AF 18-250mm delivers a very solid performance for most of the range. Unsurprisingly the weak spot is at 250mm @ f/6.3 - stopping down to f/8 is a good idea here. Nonetheless the resolution characteristic is fairly amazing regarding the extreme zoom range. Typical for such lenses the Tamron exhibits a quite extreme level of barrel distortions at 18mm but at longer focal lengths to the problem isn't overly significant. In critical situations you need to take care about vignetting at 18mm @ f/3.5 (~1.2EV) and less so at 250mm @ f/6.3 (~0.7EV). Lateral CAs (color shadows at the image borders) are on a medium level except at 250mm where the problem can get more disturbing. As to be expected for a zoom lens in this price league ( ]]> Sun, 07 Mar 2010 21:34:36 +0100