While this new lens is designed for digital SLR cameras, it can be used with both full-frame sensor and AF 35mm cameras with a zoom range of 70-300mm; or with APS-C sensor cameras where the angle of view will change the zoom range equal to 109-465mm *4. In primis, perché in generale un 70-300 completa il range focale degli zoom che normalmente sono in vendita con i kit “fotocamera + obiettivo”.

Auto-focus has many benefits but sometimes the photographer needs the control of manual focus. Full time manual offers just that: the crossover from auto-focus to manual focus by simply adjusting the focus ring, allowing the photographer to make adjustments on the fly. This feature helps the lens produce impressive results even in telephoto situations where the depth of field is narrow. Mounted on the full-frame Canon 1Ds Mark III, the lens doesn't betray any secrets - it's just a little bit softer at wide apertures. Otherwise it's mostly the same story as above - stop down to ƒ/8 to get maximum sharpness, and don't expect anything overly sharp at 200mm or 300mm. VC」により、公称でシャッター速度換算で約4段分の補正が可能となっている。望遠端で撮影している時も手ブレはまったく気になることなく、被写体がファインダー内にくっついているような印象を受けるほど強力に補正されていた。そのおかげで、今回は、1度も三脚を使うことなく撮影できた。実際に室内で静物を使って手ブレ補正の効果を試したが、筆者の場合広角側で1/8秒、望遠端で1/15秒でブレずに撮影することができた。Autofocus: The Tamron uses a built in focus motor Tamron calls USD. On my Sony A100 which is an older body from 2006 the focus speed is alright, on a much faster body like the Sony A700 the focus is fast indeed. It isn’t on the same level as the Sony SSM motor or the pro motors from the other companies, but for the price it is very good. Accuracy is alright on both my bodies, it can miss at times in low light, but that might just be my cameras. I would give it a 3/5 for focusing, it is fast and good, but not going to exactly blow you away either. The HA005 lens hood is quite long - about 3 3/4'' deep - a petal-shaped hood that attaches via a bayonet mount and can be reversed for storage. The interior of the hood is ribbed to reduce the impact of flare. I had to spend a more-than-usual amount of time focus testing this lens - just to confirm what I was seeing. The Tamron 70-300 VC will work best in this regard when shooting a subject that remains a near-constant distance from the camera under a healthy level of daylight. Giusto per darti un esempio, oltre al Tamron 70-300 F/4-5.6 Di VC USD SP di cui ti parlo in questo articolo esiste un Tamron A17 70-300Mm F/4-5.6 Di LD Macro che, pur avedno la stessa escursione focale, ha utilizzo e prezzo completamente diversi.

D700（DXフォーマットのクロップで撮影） / SP 70-300mm F4-5.6 Di VC USD / 1,848×2,784 / 1/1,000秒 / F7 / -0.3EV / ISO200 / 絞り優先AE / WB:晴天 / 300mm The lens is equipped with Tamron’s first-ever ultrasonic auto-focus drive USD (Ultrasonic Silent Drive). It achieves faster focusing making this telephoto lens perfect for photography of sports, motor racing, and other fast-moving subjects. With advanced motor technology and newly developed software, Tamron's USD delivers precise and noiseless focusing at turbo speed.Se invece sei un principiante o un amatore, secondo me il Tamron SP 70-300 F/4-5.6 Di VC USD è un obiettivo quasi imperdibile. When focusing, the internal elements of the lens move and the lens’ external size does not change. This offers better balance and easier telephoto shots. Moreover, the barrel is not subject to stray light entering from external helicoids that can negatively affect images. And because the external elements do not move, it makes it easier to utilize polarizing filters and the flower shape hood to control the amount of light that enters the lens.