Comparison of Pentax SMC P-FA 250-600mm f/5.6 ED IF and Sigma APO 300-800 f/5.6 EX DG HSM [S]ave
| Attribute |  Sigma APO 300-800 f/5.6 EX DG HSM × |  Pentax SMC P-FA 250-600mm f/5.6 ED IF × |
|---|---|---|
| Aperture (f) | 5.60 - 32.00 | 5.60 - 32.00 |
| Diagonal Angle of View (degree) | 3.10 - 8.20 | 4.10 - 9.90 |
| Magnification Ratio (x) | 0.14 | 0.2 |
| Filter Size (mm) | 46 | 43 |
| Type | Telephoto Zoom | Telephoto Zoom |
| Closest Focus (m) | 6 | 3.5 |
| APS Equivalent | 1.5x: 450 - 1200mm; 1.6x: 480 - 1280mm | 375 - 900mm |
| Diaphragm Blades | 9 | - |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 300.00 - 800.00 | 250.00 - 600.00 |
| Brand | Sigma | Pentax |
| Name | Sigma APO 300-800 f/5.6 EX DG HSM | Pentax SMC P-FA 250-600mm f/5.6 ED IF |
| Weight (g) | 5880 | 5049 |
| Zoom System | Rotary | Rotary with lock |
| Lens Construction | 18 elements in 16 groups, including 2 ELD elements | 18 elements in 16 groups, including 1 ED element |
| Diameter (mm) | 165.5 | 71 |
| Length (mm) | 544 | 442 |
| Notes | Available AF Mounts: Sigma, Canon, Nikon, Four-Thirds | - |
| Focus Details | Internal; HSM with full-time manual override | Internal |
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