Vivitar 840XHD - Manual (Page 71)

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2. A Delete One confirmation message screen will appear.
3. Use the
Right/Left button to select “Yes” or “No”.
4.
If you choose “Yes” the present picture if unlocked will be deleted from the
camera`s memory or the SD card if inserted. This process is irreversible.
5.
Pressing “No” will cancel the delete process.
6. Press the OK/Menu button to confirm and save your choice.
Lock Pictures
This function can prevent a single or all pictures from being deleted accidently.