Blændeværdi og dybdeskarphed

Begreber inden for fotografering

Du kan gøre et billedes baggrund sløret eller skarpt ved at ændre blændestørrelsen. En stor blænde giver billeder med en lille dybdeskarphed. Genstande lige foran eller bag motivet bliver slørede, mens motivet vil være i fokus. En lille blænde giver billeder med en stor dybdeskarphed. Genstande langt foran eller langt bag ved dit motiv og dit motiv vil være i fokus.

Et billede med en stor dybdeskarphed

Et billede med en lille dybdeskarphed

Blænderhuset indeholder adskillige blade. Disse blade bevæger sig sammen og kontrollerer den mængde af lys, der kommer gennem blænderens midte. Antallet af blade har også effekt på lysets former, når der tages billeder om natten. Hvis blænderen har et lige antal blade, deles lyset op i et tilsvarende antal dele. Hvis antallet af blade er ulige, vil antallet af dele være dobbelt så stort som antallet af blade.

En blænder med 8 blade deler eksempelvis lyset op i 8 dele, og en blænder med 7 blade giver 14 dele.

7 blade

8 blade

EV-NXF1ZZB1ISE, EV-NXF1ZZB2ISE, EV-NX1ZZZBQBDK, EV-NXF1ZZB1HSE, EV-NXF1ZZB2HDK specifications

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