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Zoom Encoder problems can affect Flash, Image Stabilization and Auto Focus
This menu lets you test if the Zoom Encoder in your lens is working correctly without Disassembly.
- Problems with the Zoom Encoder can cause issues with Flash, Image Stabilization, and Auto Focus.
It works by showing you a signal as you slowly move the zoom ring. If the display matches the lens zoom and all boxes light up smoothly, the encoder is working. If not, the encoder might be damaged—usually from bent or broken parts inside.
This signal also helps control the flash power when using ETTL flash.
⚠️ The most common cause of encoder failure is bent or broken wiper blades on the zoom brush.
Possible Problems from a Faulty Zoom Encoder Brush
- Inconsistent or incorrect ETTL flash exposure
- Poor or unreliable image stabilization (IS) performance
- Autofocus hesitation or inaccuracy, especially at longer focal lengths
- Incorrect or stuck focal length in EXIF data
- Possible lens communication errors or camera error messages
- Flickering or image shift during zoom in live view or video mode