Protecting our expensive new smartphone is a top priority for many of us, and online marketplaces are flooded with options, from cases to display protection. An increasingly popular product segment is camera lens protectors, which obviously make a lot of sense if you’ve just spent over $1,000 on one of the best camera phones on the market.

While sticking a cheap layer of plastic or even glass in front of your high-precision camera might help protect it from scratches, there’s a risk that it will lower the quality of the pictures you take. Not necessarily because a protector will defocus or blur your images — something this close to the lens is unlikely to do that — but even a very transparent, high-quality protective layer will slightly reduce the amount of light reaching the sensor. In t

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