Comparison of Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM and Tokina 70-200mm f/4 AT-X AF PRO FX VCM-S SD [S]ave
| Attribute |  Tokina 70-200mm f/4 AT-X AF PRO FX VCM-S SD × |  Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM × |
|---|---|---|
| Filter Size (mm) | 67 | 67 |
| Notes | Optical Image Stabilization (3-stops); Available AF Mounts: Nikon; Included Accessories: Lens hood; Tripod collar optional | Included Accessories: Lens Hood |
| Closest Focus (m) | 1 | 1 |
| Magnification Ratio (x) | 0.28 | 0.17 |
| Type | Telephoto Zoom | Telephoto Zoom |
| Length (mm) | 168 | 136 |
| APS Equivalent | 1.5x: 105 - 300mm; 1.6x: 112 - 320mm | 76.5 - 207mm |
| Zoom System | Rotary | Rotary |
| Image Circle | 35mm | APS-C |
| Focal Length (mm) | 70.00 - 200.00 | 50.00 - 135.00 |
| Brand | Tokina | Pentax |
| Name | Tokina 70-200mm f/4 AT-X AF PRO FX VCM-S SD | Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM |
| Weight (g) | 980 | 685 |
| Aperture (f) | 4.00 - 32.00 | 2.80 - 22.00 |
| Diaphragm Blades | 9 | 9 |
| Diagonal Angle of View (degree) | 12.70 - 34.80 | 11.90 - 31.50 |
| Lens Construction | 19 elements in 14 groups, including 3 SD elements | 18 elements in 14 groups, including 3 ED elements |
| Diameter (mm) | 82 | 76.5 |
| Focus Details | Internal with ultrasonic motor | Internal with "Quick Shift" AF/MF mechanism |
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