Apple iPhone 5s

fixed lens jpeg 23 shots

Display-referred, Target v1. Frequencies are cycles per stimulus pixel. Registration warp costs a little MTF equally for every capture, so compare curves and treat absolute values as slightly pessimistic.

Resolution — slanted-edge MTF · jpeg class

Higher curve = more contrast kept at that detail frequency. MTF50 is the practical sharpness number; the center-to-corner spread is the lens's field character.

0.293

MTF50 center

0.123

MTF50 mid

0.297

MTF50 corner

data table

cycles / stimulus px	center 0.29	mid 0.12	corner 0.30
0.00	1.00	1.00	1.00
0.02	0.98	0.93	0.98
0.05	0.94	0.79	0.92
0.07	0.90	0.68	0.87
0.09	0.87	0.59	0.83
0.11	0.85	0.50	0.81
0.14	0.83	0.43	0.79
0.16	0.80	0.39	0.77
0.18	0.77	0.35	0.74
0.20	0.74	0.31	0.71
0.23	0.69	0.27	0.67
0.25	0.63	0.24	0.62
0.27	0.56	0.21	0.57
0.30	0.49	0.18	0.51
0.32	0.43	0.15	0.46
0.34	0.37	0.13	0.40
0.36	0.31	0.11	0.34
0.39	0.27	0.09	0.28
0.41	0.23	0.07	0.23
0.43	0.19	0.06	0.18
0.45	0.18	0.05	0.15
0.48	0.17	0.04	0.12
0.50	0.16	0.05	0.09

Tone response — per-channel transfer

Stimulus level in, measured level out (tone-frame ramps). Raw solid, camera-JPEG dashed; the gap is the body's processing. Raw is linear-decoded, so it looks dark — that linearity is the point.

data table

stimulus level	R jpg	G jpg	B jpg
0	12	14	14
8	12	14	14
16	12	14	14
24	12	14	14
32	16	20	18
40	25	30	28
48	36	44	40
56	48	58	49
64	59	71	60
72	70	84	74
80	83	101	88
88	98	115	101
96	114	131	113
104	126	143	127
112	141	156	137
120	152	171	150
128	165	184	164
136	177	196	173
144	189	208	187
152	200	216	194
160	210	225	206
168	216	232	212
176	225	238	221
184	231	245	228
192	238	252	234
200	244	255	240
208	250	255	243
216	254	255	250
224	254	255	253
232	254	255	254
240	254	255	254
248	254	255	254

Vignette — illumination falloff

Relative to center. Includes display non-uniformity, identical for every lens on the same display.

data table

field radius	illumination
0.10	1.00
0.30	0.97
0.50	0.91
0.70	0.82
0.88	0.76

PSF — point-light kernels

Actual photographed point sources (gamma-lifted, 4x nearest-neighbor). Shape and tails are the bokeh/glow signature.

stimulus level	R jpg	G jpg	B jpg
0	12	14	14
8	12	14	14
16	12	14	14
24	12	14	14
32	16	20	18
40	25	30	28
48	36	44	40
56	48	58	49
64	59	71	60
72	70	84	74
80	83	101	88
88	98	115	101
96	114	131	113
104	126	143	127
112	141	156	137
120	152	171	150
128	165	184	164
136	177	196	173
144	189	208	187
152	200	216	194
160	210	225	206
168	216	232	212
176	225	238	221
184	231	245	228
192	238	252	234
200	244	255	240
208	250	255	243
216	254	255	250
224	254	255	253
232	254	255	254
240	254	255	254
248	254	255	254

stimulus level	R jpg	G jpg	B jpg
0	12	14	14
8	12	14	14
16	12	14	14
24	12	14	14
32	16	20	18
40	25	30	28
48	36	44	40
56	48	58	49
64	59	71	60
72	70	84	74
80	83	101	88
88	98	115	101
96	114	131	113
104	126	143	127
112	141	156	137
120	152	171	150
128	165	184	164
136	177	196	173
144	189	208	187
152	200	216	194
160	210	225	206
168	216	232	212
176	225	238	221
184	231	245	228
192	238	252	234
200	244	255	240
208	250	255	243
216	254	255	250
224	254	255	253
232	254	255	254
240	254	255	254
248	254	255	254

stimulus level	R jpg	G jpg	B jpg
0	12	14	14
8	12	14	14
16	12	14	14
24	12	14	14
32	16	20	18
40	25	30	28
48	36	44	40
56	48	58	49
64	59	71	60
72	70	84	74
80	83	101	88
88	98	115	101
96	114	131	113
104	126	143	127
112	141	156	137
120	152	171	150
128	165	184	164
136	177	196	173
144	189	208	187
152	200	216	194
160	210	225	206
168	216	232	212
176	225	238	221
184	231	245	228
192	238	252	234
200	244	255	240
208	250	255	243
216	254	255	250
224	254	255	253
232	254	255	254
240	254	255	254
248	254	255	254