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AF Tamron SP 20-40/2.7-3.5 IF
| Lens construction: | 15 elements in 12 groups |
| Focus distance: | 0.5 m to infinity |
| Angle of View: | 94° - 57° |
| Aperture scale: | f/2.7 to f/22 |
| Attachment size: | 77 mm |
| Diaphgram blades: | 6 |
| Lens hood: | C0FH (supplied) |
| Dimensions: | 81.5 mm (dia.) x 80.4 mm (length) |
| Weight: | 525 g (18.5 oz) |
|
Solidly
built, this lens weighs just 525 grams. A non-rotating front is a
further benefit. Thanks to two Hybrid Aspheric elements, this
glass ensures a good optical performance with thorough
compensation of distorsion and comatic flare. Like most wideangle
AF zooms, it employs an Internal Focusing (IF) mechanism which
leads to a faster AF response. The complex multi-element design
of this lens gives rise to severe ghosting when sunrays impinge
on the front element, despite multi-coating on the glass surfaces
(click here.gif){kind=small}
to see a counterlight shot). My sample
has a colder color rendition than my Nikkor lenses, with a slight
green color cast. According to the MTF tests performed by Photodo
(www.photodo.com), this wideangle zoom is
rated among the sharpest ones available on the market.
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Rome
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S. Stefano di Sessanio (AQ)
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Piccolomini Castle - Celano (AQ)
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Orbetello Lagoon - Orbetello (GR)
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Spoleto (Italy)
All images © Copyright Riccardo Polini
