| Tamron 18-250mm f/3.5-6.3 Di II Specifications | |
| Frame Coverage | APS-C |
| Lens Construction (groups) | 13 |
| Lens Construction (elements) | 16 |
| No. of Diaphragm Blades | 7 |
| Minimum Aperture | 22 |
| Closest Focusing Distance | 0.45m (17.7") |
| Maximum Magnifcation | .29x |
| Filter Diameter | 62mm |
| Maximum Diameter x Length | 74.4mm x 84.3mm (2.9" x 3.3") |
| Weight | 430g (15.2oz) |
Reviews
Source
PhotoZone.de
Early user comments already suggested that new Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] macro does not only offer a longer range but also a higher quality over the old Tamron AF 18-200mm XR and the lab results confirm these impressions. The results may not touch the sky but the new AF 18-250mm delivers a very solid performance for most of the range. Unsurprisingly the weak spot is at 250mm @ f/6.3 - stopping down to f/8 is a good idea here.
Bob Atkins
Performance is quite similar to that of the Canon EF-S 17-85/4-5.6 IS USM over the same focal length range. At longer focal lengths the edge quality diminishes somewhat and chromatic aberration becomes more visible, but center sharpness holds up well. Though the lens is certainly quite usable, the image quality doesn't quite match that of the Canon EF 70-300/4-5.6IS USM.
Popular Photograpy
Tamron, originator of the superzoom lens more than a decade ago, ups the ante with its new 18-250mm f/3.5-6.3 optic -- boasting the industry's broadest zoom range, at nearly 14X (13.9X). A 28-388mm equivalent, it adds 50mm to the tele end and does so at no cost of weight, dimension, or optical performance over Tamron's 18-200mm f/3.5-6.3 lens.
