I am using a zoom lens. The focal length is adjusted to 70 mm with manual focus.
I then switch off the camera. Will the focus change after i re-turn on the camera?
Noted that focal length and zoom ring remains unchanged from the beginning.
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Will the focus change after i re-turn on the camera?
Of the DSLRs that I can think of, none changes the focus setting when you turn the camera off or on. However, if you have the camera configured to focus with a half-press of the shutter release, the focus may change if you try to take a picture.
If you have the camera in your possession, it's easy enough to test: just keep an eye on the focus distance indicator on the lens as you turn the camera off and on again.