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. 2017 Jan 9;7:40203. doi: 10.1038/srep40203

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(A) Standard test for 5 different smartphones with ND filters providing OD4 to OD9 input-light power reduction with a f = 25 mm lens. iPhone 5 s and LG G2 provided the best performance on the standard performance test. Intensity profile plateaus below OD5 or 5.5. (B) The same result without the focusing lens. For maximum-performance tests, iphone 5 s and Oneplus One were selected. (C) Maximum performance test for Oneplus One. (D) Result for iPhone 5 s, where a maximum performance of OD6-6.5 is possible. Utilizing 60 seconds of exposure time with commercial apps and NREA simultaneously, both phones were able to detect the presence of light intensity down to OD6.5 to 7.