Black Cat Decoder
---Decoder Use---
ULC™
ISO
Shutter
Speed
f-stop
A4
A3
A2
A1
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Z1
Z2
Z3
Z4
6400
3200
1600
800
400
200
100
50
25
12.5
6
3
1.5
.75
.35
.2
.1
4 hour
2 hour
1 hour
30 min
15 min
8 min
4 min
2 min
1 min
30 sec
15 sec
8 sec
4 sec
2 sec
1 sec
1/2
1/4
1/8
1/15
1/30
1/60
1/125
1/250
1/500
1/1000
1/2000
1/4000
1/8000
f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16
f/22
f/32
f/45
f/64
f/90
f/128
f/179
f/256
f/358
f/512
f/717
f/1024
This interactive chart was created by
Frank Kujawski
and is based on the
Black Cat Extended Range Exposure Guide
by
Jim Lehman