Canon Camera Hackers Manual page 126

get_user_av_id x
x = get_user_av_id()
set_user_av_by_id x
set_user_av_by_id(x)
Retrieves and sets the index of the aperture index set by the user (3 units per f-stop).
get_user_av96 x
x = get_user_av96()
set_user_av96 x
set_user_av96(x)
Retrieves and sets the internal value of the aperture set by the user (96 units per
f-stop).
set_av_rel x
set_av_rel(x)
Modifies the real aperture relative to the current aperture. A negative x makes the
aperture wider, a positive x makes it smaller (3 units per f-stop).
set_user_av_by_id_rel x
set_user_av_by_id_rel(x)
Modifies the aperture set by the user (3 units per f-stop).
set_nd_filter f
set_nd_filter(f)
Sets the neutral density filter: 0 = off, 1 = in, 2 = out. This command has no effect on
cameras without an ND filter.
Index Av96
9 288
10 320
11 352
12 384
13 416
14 448
15 480
16 512
17 544
18 576
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
Aperture
f/2.8
f/3.2
f/3.5
f/4.0
f/4.5
f/5.0
f/5.6
f/6.3
f/7.1
f/8.0
5.5 CHDK commands
Table 5-2
Apertur e index vs. aperture
117