Figure 4: Standard and maximum-performance test for inter-phone variations.
From: Smartphone-based low light detection for bioluminescence application
(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.
