104, Følsomhed Ledetal for indbygget ﬂash

Optagelse med indbygget blitz

Afstand og blænde ved optagelse med indbygget ﬂash

■I forbindelse med ﬂashoptagelser skal der vælges et kriterie mellem ledetal- let, blænden og afstanden. Beregn og juster optageforholdene, hvis ﬂashen ikke er tilstrækkelig.

●Ledetal for indbygget ﬂash

Følsomhed	Ledetal for indbygget ﬂash
ISO 100	13
ISO 200	18.4
ISO 400	26
ISO 800	36.7
ISO 1600	52

Beregning af blændeværdi på baggrund af optageafstand

Følgende ligning beregner blændeværdien for optageafstande.

Anvendt blændeværdi F = Ledetal ÷ optageafstand

Eksempel)

Når følsomheden er [ISO200], og optageafstanden er 6,1 m, er blændeværdien: F = 18.4 ÷ 6.1 = 3

Hvis den resulterende blændeværdi (3 i ovenstående eksempel) ikke kan vælges på objektivet, anvendes som regel den nærmeste lavere blænde (2,8 i ovenstående eksempel).

Beregning af optageafstand på baggrund af blænde- værdi

■Følgende ligning beregner ﬂashafstanden for blændeværdier. Maksimum blitz distance L1 = Ledetal ÷ Valgt blænde Maksimum blitz distance L2 = Maksimum blitz distance L1 ÷ 5*

*Værdien 5 brugt i formlen overfor er en fast værdi som kun gælder når optagelse med den indbygget blitz.

Eksempel)

Når følsomheden er [ISO200], og blændeværdien er F4

L1 = 18,4 ÷ 4 = ca. 4,6 (m)

L2 = 4,6 ÷ 5 = ca. 0,9 (m)

Derfor, kan blitzen bruges i områder fra omkring 0,9 m til 4,6 meter. Blitzen kan ikke bruges på en afstand på mindre end 0,8 meter. Når blitzen benyttes på afstande mindre end 0,8 meter, kan den forårsage vignettering i billedets hjørner, lys bliver distribueret ujævnt og billedet kan blive over-eksponeret

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ER-GX20ZBBA/SE, ER-GX20ZBBA/E1, ER-GX20ZBBB/E1, ER-GX20ZBBA/DK, ER-GX20ZBBC/E1 specifications

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Samsung ER-GX20ZBBC/E1 manual Beregning af optageafstand på baggrund af blænde- værdi, 104

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