Canon Camera - Page 124

5.5 CHDK commands 115
get_user_tv96 x uBasic
x = get_user_tv96() Lua
set_user_tv96 x uBasic
set_user_tv96(x) Lua
Retrieves and sets the value of the internal exposure time set by the user (96 units
per f-stop).
set_tv_rel x uBasic
set_tv_rel(x) Lua
Modifies the current exposure time. A negative x makes the exposure time longer,
a positive x makes it shorter (3 units per f-stop).
set_user_tv_by_id_rel x uBasic
set_user_tv_by_id_rel(x) Lua
Modifies the exposure time set by the user (3 units per f-stop).
set_tv96_direct x uBasic
set_tv96_direct(x) Lua
Sets the exposure time value with 96 units per f-stop.
Index Tv96 Speed Index Tv96 Speed
–12 –384 15" 18 576 1/60
–11 –352 13" 19 608 1/80
–10 –320 10" 20 640 1/100
–9 –288 8" 21 672 1/125
–8 –256 6" 22 704 1/160
–7 –224 5" 23 736 1/200
–6 –192 4" 24 768 1/250
–5 –160 3"2 25 800 1/320
–4 –128 2"5 26 832 1/400
–3 –96 2" 27 864 1/500
–2 –64 1"6 28 896 1/640
–1 –32 1"3 29 928 1/800
001" 30 960 1/1000
1320"8 31 992 1/1250
2640"6 32 1024 1/1600
Table 5-1
Exposu re index vs. exposure time