Product Name: Eye Mask
Model: EF
Material: Rubber & Plastic
Replacement: Original Canon Eye Mask EF
Support Canon camera models below: EOS 550D/500D/450D/1000D/400D/350D/300D/300X/300V/3000V
EOS 760D / 750D / 700D / 650D / 600D / 550D / 500D / 450D / 100D / 1200D / 1100D / 1000D
The eyecup is mainly used to prevent light from entering the eyepiece during long-term B-bulb exposure to take pictures; it can also prevent the eyepiece from being scratched when the camera is not used; and to prevent debris from entering the viewfinder when the camera is stored.
How to use eye mask or extender?
First remove the rubber eye cup when using it, and then insert the eye cup or the extender into the external card slot of the viewfinder.
![](https://img.alicdn.com/imgextra/i1/722138446/TB2hAu7zeGSBuNjSspbXXciipXa_!!722138446.jpg)
![](https://img.alicdn.com/imgextra/i2/722138446/TB2c3zszf9TBuNjy1zbXXXpepXa_!!722138446.jpg)
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