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That Rubber Thing on Your Canon Strap is for Preventing Light Leaks

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Here’s a really neat quick tip about your standard, in-the-box Canon camera strap that you probably didn’t know about. That rubber thing attached to the strap? It’s actually serves a very specific purpose.

Photographer Bassam Sabbagh explained the point of the “rubber thingy” to the folks at DIY Photography. Apparently, it’s there to block your viewfinder when you’re taking extra-long exposures, so there are absolutely no light leaks coming in through the back of the camera. Check out the video above to see how it works.

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We absolutely love simple little tips like this. Do you know of any others we should share?


UPDATE: Some readers called the light leak conclusion into question, so we dug into the Canon 80D manual. Here is what it has to say about the Eyepiece Cover (AKA: The Rubber Thingy):

When you take a picture without looking through the viewfinder, such as when you use the self-timer, bulb exposure, or a remote switch, stray light entering the viewfinder can cause the picture to look dark. To prevent this, use the eyepiece cover attached to the camera strap.

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