Pentax 2170 Review: Pentax DA* 200mm f/2.8 ED IF SDM Lens for Pentax DSLR Cameras. In order to augment my Pentax DA*50-135 f2.8 with more reach, I had been interested in the Tamron 70-200 f2.8 but decided to go with the Pentax DA*200 f2.8 - I really wanted the SDM focus motor of the Pentax lens. Online professional lab tests indicated typical prime lens performance in near zero distortion and across-the-frame level sharpness over a wide range of apertures. But the caution here is the surprisingly high level of purple fringing they experienced at open apertures.The construction, feel and appearance of this lens is ... Read more »
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