Comparison of Pentax SMC P-D FA 100mm f/2.8 Macro and Tamron SP AF 90mm f/2.8 Di Macro 1:1 [S]ave
| Attribute |  Tamron SP AF 90mm f/2.8 Di Macro 1:1 × |  Pentax SMC P-D FA 100mm f/2.8 Macro × |
|---|---|---|
| Diameter (mm) | 71.5 | 67.5 |
| Aperture (f) | 2.80 - 32.00 | 2.80 - 32.00 |
| Diagonal Angle of View (degree) | 27.00 | 24.50 |
| Magnification Ratio (x) | 1 | 1 |
| Filter Size (mm) | 55 | 49 |
| Type | Telephoto Prime Macro | Telephoto Prime Macro |
| Closest Focus (m) | 0.29 | 0.3 |
| APS Equivalent | 1.5x: 135mm; 1.6x: 144mm | 150mm |
| Diaphragm Blades | 9 | 8 |
| Image Circle | Image Circle | 35mm |
| Focal Length (mm) | 90.00 | 100.00 |
| Brand | Tamron | Pentax |
| Name | Tamron SP AF 90mm f/2.8 Di Macro 1:1 | Pentax SMC P-D FA 100mm f/2.8 Macro |
| Weight (g) | 405 | 345 |
| Focus Details | External focus system, lens length varies while focusing | - |
| Length (mm) | 97 | 80.5 |
| Notes | Available mounts: Canon, Minolta, Nikon, Pentax; Includes lens hood and case. | - |
| Lens Construction | 10 elements in 9 groups | 9 elements in 8 groups |
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