Please excuse my impudence
As far as setting a precise subject distance is concerned, the Canon firmware decides the nearest value to move to.As you focus further away the steps become bigger because the depth-of-field region is rapidly increasing.Very close up, you can move one millimetre at a time.
To set manual focus mode your script needs to 'press' whatever buttons are needed on your camera.You will then set a variable to a non-zero value to indicate you are in manual-focus mode.
When I try to set the focus to (for example) 1500, Canon decides that the nearest value is (for example) 1510. However, tomorrow I try again to set the focus to 1500, and Canon decides that the nearest value is 1507. Why is this difference?
Is there a way to toggle MF mode and to check if the camera is in it?My camera does not officially support manual focus. The only way to manually change the focus is through ALT mode in CHDK.
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