Fotocamera > Obiettivi

Contrassegni obiettivo

Scoprite cosa significano i numeri sull'obiettivo.

Obiettivo SAMSUNG 18-200 mm F3.5-6.3 ED OIS (esempio)

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N.Descrizione

Diaframma

1Una gamma di tempi di posa. Ad esempio, 1:3.5-6.3 indica un un intervallo massimo di tempo di posa da 3,5 a 6,3.

Lunghezza focale

La distanza dal centro dell'obiettivo al punto focale (in millimetri).

2Questa cifra è espressa in un intervallo: lunghezza focale minima a lunghezza focale massima dell'obiettivo.

Lunghezze focali maggiori riducono le angolature e ingrandiscono il soggetto. Lunghezze focali minori determinano angolature più ampie.

ED

ED significa Extra-low Dispersion (dispersione molto bassa).

3Il vetro a dispersione molto bassa è efficace per ridurre l'aberrazione cromatica (una distorsione che si verifica quando una lente non riesce ad eseguire la messa a fuoco di tutti i colori allo stesso punto di convergenza).

OIS (pag. 71)

4Stabilizzazione ottica delle immagini. Gli obiettivi con questa funzione possono rilevare l'oscillazione della fotocamera e annullare efficacemente il movimento all'interno della fotocamera.

Ø

5Il diametro dell'obiettivo. Quando collegate un filtro all'obiettivo, accertatevi che i diametri dello stesso e del filtro siano uguali.

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