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Step 7CHDK Settings: Extra Photo Operations
Now go into the Extra Photo Operations menu at the top of the main menu and set:
Disable Overrides [disable]
Include AutoIso & Bracketi [.]
Override shutter speed [1/10000]
Value factor [1]
Shutterspeed emun type [Ev Step]
Override aperture [5.03]
Override Subj. Dist. V [350]
Value factor [1]
Override ISO value [80]
Value factor [1]
Force manual flash [.]
Power of flash [1]
In order to get the right exposure you will have to adjust the aperture, ISO, and flash power settings.
Lower aperture numbers will brighten the shot, higher numbers will darken the shot.
Keep in mind that the higher power of flash, the longer the flash's duration will be. You will want to use the lowest flash power that provides sufficient exposure. Flash power of zero is very feeble and you may need to use 1.
For the ISO you will want to use a low ISO value because higher ISO's cause more noise and the resulting pictures look grainy . The overall ISO is the value times the factor. Factor can be 1, 10 or 100 giving you an ISO anywhere between 0 and around 32000. Keep in mind that ISO's lower than 40 or higher than 800 are most likely beyond what the camera can actually achieve.
The CHDK wiki says it best:
Just because you can set an override shutter-speed, f/stop or ISO sensitivity on your camera with CHDK, it doesn't mean your camera can actually do that setting. Be sure you have tested to make sure that extreme setting is actually making a difference in your resulting images.
Override Subj. Dist. is supposed to override the auto-focus forcing the camera to focus at a desired distance. I can't seem to get this to work. I'm not sure if I'm doing something wrong, or if there is a bug. My work-around is when the camera is being armed it will auto-focus and I put my finger at the point where the drop is going to land, letting the camera auto-focus there.
Disable Overrides [disable]
Include AutoIso & Bracketi [.]
Override shutter speed [1/10000]
Value factor [1]
Shutterspeed emun type [Ev Step]
Override aperture [5.03]
Override Subj. Dist. V [350]
Value factor [1]
Override ISO value [80]
Value factor [1]
Force manual flash [.]
Power of flash [1]
In order to get the right exposure you will have to adjust the aperture, ISO, and flash power settings.
Lower aperture numbers will brighten the shot, higher numbers will darken the shot.
Keep in mind that the higher power of flash, the longer the flash's duration will be. You will want to use the lowest flash power that provides sufficient exposure. Flash power of zero is very feeble and you may need to use 1.
For the ISO you will want to use a low ISO value because higher ISO's cause more noise and the resulting pictures look grainy . The overall ISO is the value times the factor. Factor can be 1, 10 or 100 giving you an ISO anywhere between 0 and around 32000. Keep in mind that ISO's lower than 40 or higher than 800 are most likely beyond what the camera can actually achieve.
The CHDK wiki says it best:
Just because you can set an override shutter-speed, f/stop or ISO sensitivity on your camera with CHDK, it doesn't mean your camera can actually do that setting. Be sure you have tested to make sure that extreme setting is actually making a difference in your resulting images.
Override Subj. Dist. is supposed to override the auto-focus forcing the camera to focus at a desired distance. I can't seem to get this to work. I'm not sure if I'm doing something wrong, or if there is a bug. My work-around is when the camera is being armed it will auto-focus and I put my finger at the point where the drop is going to land, letting the camera auto-focus there.
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