Comparison of Olympus 90-250mm f/2.8 PRO ED Zuiko Digital and Tamron SP AF 300mm f/2.8 LD IF [S]ave
| Attribute |  Olympus 90-250mm f/2.8 PRO ED Zuiko Digital × |  Tamron SP AF 300mm f/2.8 LD IF × |
|---|---|---|
| Zoom System | Rotary | - |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 32.00 |
| Diagonal Angle of View (degree) | 5.00 - 14.00 | 8.00 |
| Filter Size (mm) | 105 | 43 |
| Notes | Includes Lens Hood (LH-120B) and Lens Case (LSH-1738) | Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood, Case |
| APS Equivalent | - | 1.5x: 450mm; 1.6x: 480mm |
| Type | Telephoto Zoom | Telephoto Prime |
| Diaphragm Blades | 9 | 9 |
| Lens Construction | 17 elements in 12 groups, including 3 ED elements | 10 elements in 7 groups, including 2 LD elements |
| Image Circle | Image Circle | 35mm |
| Focal Length (mm) | 90.00 - 250.00 | 300.00 |
| Brand | Olympus | Tamron |
| Name | Olympus 90-250mm f/2.8 PRO ED Zuiko Digital | Tamron SP AF 300mm f/2.8 LD IF |
| Weight (g) | 3270 | 2800 |
| Diameter (mm) | 124 | 120 |
| Length (mm) | 276 | 215.9 |
| 35mm Equivalent | 180 - 500mm | - |
| Magnification Ratio (x) | 0.08 | 0.141 |
| Focus Details | - | Internal; Focus ring slides back and forth to switch between AF and MF |
| Closest Focus (m) | 2.5 | 2.5 |
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