EV - exposure value = expoziční hodnota, podexponování, přeexponování
Většina digitálních fotoaparátů nabízí možnost změnit expozici snímku. Povětšinou to je tlačítkem na kterém je ve čtverečku nakresleno plus a mínus, oddělené uhlopříčkou. Na displeji se značí často EV - z anglického exposure value (expoziční hodnota).
Copak je to exposure value? Tož fyzikálně definice:
Ev=log2(N2/t)
kde:
N .. aperture, tj. clonové číslo f
t .. čas expozice
log2 .. je samozřejmě logaritmus o základě 2
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| EV | clonové číslo f | ||||||||||||||||||||||
| 1 | 1.4 | 1.8 | 2 | 2.8 | 3.2 | 3.5 | 4 | 4.5 | 5 | 5.6 | 6.3 | 7.1 | 8 | 9 | 10 | 11 | 13 | 14 | 16 | 18 | 20 | 22 | |
| 1 | 0.0 | 1.0 | 1.7 | 2.0 | 3.0 | 3.4 | 3.6 | 4.0 | 4.3 | 4.6 | 5.0 | 5.3 | 5.7 | 6.0 | 6.3 | 6.6 | 6.9 | 7.4 | 7.6 | 8.0 | 8.3 | 8.6 | 8.9 |
| ½ | 1.0 | 2.0 | 2.7 | 3.0 | 4.0 | 4.4 | 4.6 | 5.0 | 5.3 | 5.6 | 6.0 | 6.3 | 6.7 | 7.0 | 7.3 | 7.6 | 7.9 | 8.4 | 8.6 | 9.0 | 9.3 | 9.6 | 9.9 |
| ¼ | 2.0 | 3.0 | 3.7 | 4.0 | 5.0 | 5.4 | 5.6 | 6.0 | 6.3 | 6.6 | 7.0 | 7.3 | 7.7 | 8.0 | 8.3 | 8.6 | 8.9 | 9.4 | 9.6 | 10.0 | 10.3 | 10.6 | 10.9 |
| 1/8 | 3.0 | 4.0 | 4.7 | 5.0 | 6.0 | 6.4 | 6.6 | 7.0 | 7.3 | 7.6 | 8.0 | 8.3 | 8.7 | 9.0 | 9.3 | 9.6 | 9.9 | 10.4 | 10.6 | 11.0 | 11.3 | 11.6 | 11.9 |
| 1/10 | 3.3 | 4.3 | 5.0 | 5.3 | 6.3 | 6.7 | 6.9 | 7.3 | 7.7 | 8.0 | 8.3 | 8.6 | 9.0 | 9.3 | 9.7 | 10.0 | 10.2 | 10.7 | 10.9 | 11.3 | 11.7 | 12.0 | 12.2 |
| 1/15 | 3.9 | 4.9 | 5.6 | 5.9 | 6.9 | 7.3 | 7.5 | 7.9 | 8.2 | 8.6 | 8.9 | 9.2 | 9.6 | 9.9 | 10.2 | 10.6 | 10.8 | 11.3 | 11.5 | 11.9 | 12.2 | 12.6 | 12.8 |
| 1/20 | 4.3 | 5.3 | 6.0 | 6.3 | 7.3 | 7.7 | 7.9 | 8.3 | 8.7 | 9.0 | 9.3 | 9.6 | 10.0 | 10.3 | 10.7 | 11.0 | 11.2 | 11.7 | 11.9 | 12.3 | 12.7 | 13.0 | 13.2 |
| 1/30 | 4.9 | 5.9 | 6.6 | 6.9 | 7.9 | 8.3 | 8.5 | 8.9 | 9.2 | 9.6 | 9.9 | 10.2 | 10.6 | 10.9 | 11.2 | 11.6 | 11.8 | 12.3 | 12.5 | 12.9 | 13.2 | 13.6 | 13.8 |
| 1/60 | 5.9 | 6.9 | 7.6 | 7.9 | 8.9 | 9.3 | 9.5 | 9.9 | 10.2 | 10.6 | 10.9 | 11.2 | 11.6 | 11.9 | 12.2 | 12.6 | 12.8 | 13.3 | 13.5 | 13.9 | 14.2 | 14.6 | 14.8 |
| 1/80 | 6.3 | 7.3 | 8.0 | 8.3 | 9.3 | 9.7 | 9.9 | 10.3 | 10.7 | 11.0 | 11.3 | 11.6 | 12.0 | 12.3 | 12.7 | 13.0 | 13.2 | 13.7 | 13.9 | 14.3 | 14.7 | 15.0 | 15.2 |
| 1/100 | 6.6 | 7.6 | 8.3 | 8.6 | 9.6 | 10.0 | 10.3 | 10.6 | 11.0 | 11.3 | 11.6 | 12.0 | 12.3 | 12.6 | 13.0 | 13.3 | 13.6 | 14.0 | 14.3 | 14.6 | 15.0 | 15.3 | 15.6 |
| 1/125 | 7.0 | 7.9 | 8.7 | 9.0 | 9.9 | 10.3 | 10.6 | 11.0 | 11.3 | 11.6 | 11.9 | 12.3 | 12.6 | 13.0 | 13.3 | 13.6 | 13.9 | 14.4 | 14.6 | 15.0 | 15.3 | 15.6 | 15.9 |
| 1/200 | 7.6 | 8.6 | 9.3 | 9.6 | 10.6 | 11.0 | 11.3 | 11.6 | 12.0 | 12.3 | 12.6 | 13.0 | 13.3 | 13.6 | 14.0 | 14.3 | 14.6 | 15.0 | 15.3 | 15.6 | 16.0 | 16.3 | 16.6 |
| 1/250 | 8.0 | 8.9 | 9.7 | 10.0 | 10.9 | 11.3 | 11.6 | 12.0 | 12.3 | 12.6 | 12.9 | 13.3 | 13.6 | 14.0 | 14.3 | 14.6 | 14.9 | 15.4 | 15.6 | 16.0 | 16.3 | 16.6 | 16.9 |
| 1/500 | 9.0 | 9.9 | 10.7 | 11.0 | 11.9 | 12.3 | 12.6 | 13.0 | 13.3 | 13.6 | 13.9 | 14.3 | 14.6 | 15.0 | 15.3 | 15.6 | 15.9 | 16.4 | 16.6 | 17.0 | 17.3 | 17.6 | 17.9 |
| 1/1000 | 10.0 | 10.9 | 11.7 | 12.0 | 12.9 | 13.3 | 13.6 | 14.0 | 14.3 | 14.6 | 14.9 | 15.3 | 15.6 | 16.0 | 16.3 | 16.6 | 16.9 | 17.4 | 17.6 | 18.0 | 18.3 | 18.6 | 18.9 |
| 1/2000 | 11.0 | 11.9 | 12.7 | 13.0 | 13.9 | 14.3 | 14.6 | 15.0 | 15.3 | 15.6 | 15.9 | 16.3 | 16.6 | 17.0 | 17.3 | 17.6 | 17.9 | 18.4 | 18.6 | 19.0 | 19.3 | 19.6 | 19.9 |
| 1/4000 | 12.0 | 12.9 | 13.7 | 14.0 | 14.9 | 15.3 | 15.6 | 16.0 | 16.3 | 16.6 | 16.9 | 17.3 | 17.6 | 18.0 | 18.3 | 18.6 | 18.9 | 19.4 | 19.6 | 20.0 | 20.3 | 20.6 | 20.9 |
Vloženo: 07.06.2009 06:22
Přečteno:3014
Autor: David Mizera
Přečteno:3014
Autor: David Mizera
Hlasů: 3 Hodnocení(jako ve škole): 1