Comparison of Pentax SMC P-FA 20-35mm f/4 AL and Vivitar 19-35mm f/3.5-4.5 Series 1 AF [S]ave
| Attribute |  Vivitar 19-35mm f/3.5-4.5 Series 1 AF × |  Pentax SMC P-FA 20-35mm f/4 AL × |
|---|---|---|
| Name | Vivitar 19-35mm f/3.5-4.5 Series 1 AF | Pentax SMC P-FA 20-35mm f/4 AL |
| Weight (g) | 300 | 245 |
| Image Circle | 35mm | 35mm |
| Brand | Vivitar | Pentax |
| APS Equivalent | 1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm | 30 - 52.5mm |
| Focal Length (mm) | 19.00 - 35.00 | 20.00 - 35.00 |
| Closest Focus (m) | 0.5 | 0.3 |
| Diameter (mm) | 82 | 69.5 |
| Filter Size (mm) | 77 | 58 |
| Magnification Ratio (x) | 0.08 | 0.06 |
| Aperture (f) | 3.50 - 27.00 | 4.00 - 22.00 |
| Diagonal Angle of View (degree) | 63.00 - 97.00 | 64.00 - 94.00 |
| Zoom System | Rotary | Rotary |
| Type | Wide Zoom | Wide Zoom |
| Lens Construction | 13 elements in 11 groups | 10 elements in 8 groups, including 2 aspherical elements |
| Notes | Available AF mounts: Canon, Minolta, Nikon, Pentax | - |
| Length (mm) | 69 | 68 |
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