Fotograferingsbegrepp

Slutarhastighet

Slutarhastighet syftar på den tid det tar att öppna och stänga slutaren. Den kontrollerar mängden ljus som passerar genom bländaren innan det når bildsensorn.

Slutarhastigheter mäts i sekunder och delar av en sekund. På många kameror halveras slutarhastigheterna med varje efterföljande inställning

1 sek., 1/2 sek., 1/4 sek., 1/8 sek., 1/15 sek. o.s.v. Precis som efterföljande bländarinställningar släpper varje efterföljande slutarhastighet in ungefär hälften mängd ljus. Varje efterföljande slutarhastighetsinställning är följaktligen lika med en EV-ändring (exponeringsvärde) på ungefär 1 EV.

 

+1 EV

 

 

 

 

Exponering

 

 

 

 

 

 

 

 

-1 EV

 

 

1 sek.

1/2 sek.

1/4 sek.

1/8 sek.

1/15 sek.

1/30 sek.

 

 

Slutarhastighet

 

 

Därför blir det så att ju snabbare slutarhastighet, desto mindre ljus släpps in. På samma sätt gäller att ju lägre slutarhastighet, desto mer ljus kan släppas in.

En långsam slutarhastighet släpper in mer ljus i kameran för att göra bilderna ljusare. Men eftersom slutaren är öppen längre blir motiv i rörelse suddiga. En snabb slutarhastighet släpper in mindre ljus vilket gör bilderna mörkare. Men eftersom slutaren är öppen under en kort tid blir motiv i rörelse skarpare och i fokus.

1 sek.

1/250 sek.

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