Tested: Pentax 50-200mm f/4-5.6 DA WR

Specifications: 50–200mm (50.01–193.26mm tested), f/4–5.6 (f/3.80–5.81 tested), 11 elements in 10 groups. Focus ring turns 200°. Zoom ring turns 90°. Focal lengths marked at 50-, 80-, 100-, 135-, and 200mm.

Diagonal view angle: 31–8 degrees

Weight: 0.68 lb   

Filter Size: 49mm

Mounts: Pentax KAF

Included: Lenshood

Street Price: $215

Test Results:

Distortion: At 50mm, 0.05% (Imperceptible) barrel. At 100mm, 0.22% (Slight) pincushion. At 200mm, 0.23% (Slight) pincushion. 

Light Falloff: At 50mm, gone by f/5. At 100mm, by f/5.6. At 200mm, by f/8. 

Close Focusing Distance: 44.8 inches.

Maximum Magnification Ratio: At 50mm, 1:15.28. At 100mm, 1:7.78. At 200mm, 1:3.97.