Hi everybody,
I noticed something probably incorrect in CHDK 1.1.0.2033.0
I wanted to find the lowest and highest values for ISO for my Canon 720 IS,
so I wrote this short lua script:
--[[
@title Test
--]]
sleep(2000)
file, msg, no = io.open("A/CHDK/log.txt", "w")
if file==nil then
print('file not opened')
sleep(2000)
exit_alt()
end
set_tv96(640)
set_av96(288)
set_iso_mode(0)
set_sv96(1056)
shoot()
for i=96,1152,96 do
print(i)
set_tv96(640)
sleep(200)
tv=get_tv96()
set_av96(288)
sleep(200)
av=get_av96()
set_iso_mode(0)
set_sv96(i)
sleep(200)
sv=get_sv96()
isoreal=get_iso_real()
isomarket=get_iso_market()
isomode=get_iso_mode()
ret,msg,no = file:write(string.format("i=%d tv=%d av=%d sv=%d - realISO=%d marketISO=%d isoMode=%d \r\n", i, tv, av, sv, isoreal, isomarket, isomode))
shoot()
end
file:close()
sleep(2000)
--exit_alt()
shut_down()
I put my camera to Manual (Av works too, Tv and P do not allow correct settings)
and started the script, I got this log:
i=96 tv=640 av=303 sv=1056 - realISO=6888 marketISO=10532 isoMode=0
i=192 tv=640 av=303 sv=96 - realISO=6 marketISO=10 isoMode=0
i=288 tv=640 av=303 sv=192 - realISO=13 marketISO=20 isoMode=0
i=384 tv=640 av=303 sv=288 - realISO=26 marketISO=41 isoMode=0
i=480 tv=640 av=303 sv=384 - realISO=53 marketISO=82 isoMode=0
i=576 tv=640 av=303 sv=480 - realISO=107 marketISO=164 isoMode=0
i=672 tv=640 av=303 sv=576 - realISO=215 marketISO=329 isoMode=0
i=768 tv=640 av=303 sv=672 - realISO=430 marketISO=658 isoMode=0
i=864 tv=640 av=303 sv=768 - realISO=861 marketISO=1316 isoMode=0
i=960 tv=640 av=303 sv=864 - realISO=1722 marketISO=2633 isoMode=0
i=1056 tv=640 av=303 sv=960 - realISO=3444 marketISO=5266 isoMode=0
i=1152 tv=640 av=303 sv=1056 - realISO=6888 marketISO=10532 isoMode=0
You can notice that:
1) in the first line of the log I set value 96 for sv and I read 1056
2) in the following lines sv is set with a value and read with the previous one
(strange enough sv is the same as i in the previous line)
3) av is set to 288 (f/2.8 that my Canon has) but in the log you can
see 303 (in other logs the first one was 288 and the following 303),
anyway EXIF reports 2.8
4) I had to put iso_mode(0) to prevent that the first image be shoot with the
ISO settings set on the camera (it was 400 ISO, so value=4, in non-CHDK settings)
5) realISO and marketISO are not the rounded values like 160/320/640 I would expect,
this causes some trouble in exact measurements
I took these values from Daum book from Rooky Nook (good book but sometimes imprecise).
The part of code before the loop is useful for avoiding first-shot ineffective value settings.
Can anybody confirm that is incorrect beavior (or tell me where I am wrong)?
Thank you in advance
Clausfor
