Sony A7C II + SG-image 35mm F2.2

Sony A7C II jpegraw 36 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.

0.321

MTF50 center

0.345

MTF50 mid

0.290

MTF50 corner

data table

cycles / stimulus px	center 0.32	mid 0.34	corner 0.29
0.00	1.00	1.00	1.00
0.02	0.99	0.98	0.99
0.05	0.98	0.95	0.97
0.07	0.95	0.92	0.93
0.09	0.92	0.90	0.89
0.11	0.89	0.88	0.86
0.14	0.87	0.85	0.82
0.16	0.81	0.82	0.78
0.18	0.74	0.81	0.73
0.20	0.71	0.77	0.68
0.23	0.66	0.72	0.63
0.25	0.62	0.66	0.57
0.27	0.59	0.63	0.52
0.30	0.54	0.61	0.46
0.32	0.51	0.57	0.41
0.34	0.46	0.51	0.37
0.36	0.37	0.45	0.34
0.39	0.30	0.42	0.29
0.41	0.23	0.38	0.24
0.43	0.18	0.35	0.21
0.45	0.15	0.33	0.20
0.48	0.08	0.30	0.19
0.50	0.04	0.28	0.18

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 raw	G raw	B raw	R jpg	G jpg	B jpg
0	2	2	2	6	13	13
8	2	2	2	6	13	13
16	2	2	2	6	13	13
24	2	2	2	6	13	13
32	2	3	3	10	19	20
40	3	5	5	17	32	36
48	5	7	7	30	48	56
56	7	10	10	44	66	78
64	10	14	13	60	84	101
72	13	18	18	77	103	122
80	17	23	23	94	121	148
88	22	29	28	115	139	168
96	26	34	34	135	156	187
104	31	41	42	152	171	208
112	37	48	48	171	186	225
120	42	56	54	186	198	239
128	50	64	63	201	208	253
136	55	73	71	215	219	255
144	63	82	83	229	225	255
152	70	91	89	241	232	255
160	78	100	102	252	238	255
168	85	109	107	255	243	255
176	93	115	118	255	246	255
184	101	125	128	255	248	255
192	109	134	137	255	251	255
200	116	144	147	255	254	255
208	127	152	155	255	255	255
216	135	163	166	255	255	255
224	143	169	173	255	255	255
232	146	172	175	255	255	255
240	146	172	175	255	255	255
248	146	172	175	255	255	255

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	0.99
0.30	0.92
0.50	0.79
0.70	0.64
0.88	0.54

Veiling glare (haze)

Black-side spill far from the white half of the split frame, as % of white. Lower = clearer shadows.

0.31%

veiling glare · raw (n=2)

0.59%

veiling glare · jpeg (n=3)

PSF — point-light kernels

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

stimulus level	R raw	G raw	B raw	R jpg	G jpg	B jpg
0	2	2	2	6	13	13
8	2	2	2	6	13	13
16	2	2	2	6	13	13
24	2	2	2	6	13	13
32	2	3	3	10	19	20
40	3	5	5	17	32	36
48	5	7	7	30	48	56
56	7	10	10	44	66	78
64	10	14	13	60	84	101
72	13	18	18	77	103	122
80	17	23	23	94	121	148
88	22	29	28	115	139	168
96	26	34	34	135	156	187
104	31	41	42	152	171	208
112	37	48	48	171	186	225
120	42	56	54	186	198	239
128	50	64	63	201	208	253
136	55	73	71	215	219	255
144	63	82	83	229	225	255
152	70	91	89	241	232	255
160	78	100	102	252	238	255
168	85	109	107	255	243	255
176	93	115	118	255	246	255
184	101	125	128	255	248	255
192	109	134	137	255	251	255
200	116	144	147	255	254	255
208	127	152	155	255	255	255
216	135	163	166	255	255	255
224	143	169	173	255	255	255
232	146	172	175	255	255	255
240	146	172	175	255	255	255
248	146	172	175	255	255	255

stimulus level	R raw	G raw	B raw	R jpg	G jpg	B jpg
0	2	2	2	6	13	13
8	2	2	2	6	13	13
16	2	2	2	6	13	13
24	2	2	2	6	13	13
32	2	3	3	10	19	20
40	3	5	5	17	32	36
48	5	7	7	30	48	56
56	7	10	10	44	66	78
64	10	14	13	60	84	101
72	13	18	18	77	103	122
80	17	23	23	94	121	148
88	22	29	28	115	139	168
96	26	34	34	135	156	187
104	31	41	42	152	171	208
112	37	48	48	171	186	225
120	42	56	54	186	198	239
128	50	64	63	201	208	253
136	55	73	71	215	219	255
144	63	82	83	229	225	255
152	70	91	89	241	232	255
160	78	100	102	252	238	255
168	85	109	107	255	243	255
176	93	115	118	255	246	255
184	101	125	128	255	248	255
192	109	134	137	255	251	255
200	116	144	147	255	254	255
208	127	152	155	255	255	255
216	135	163	166	255	255	255
224	143	169	173	255	255	255
232	146	172	175	255	255	255
240	146	172	175	255	255	255
248	146	172	175	255	255	255

stimulus level	R raw	G raw	B raw	R jpg	G jpg	B jpg
0	2	2	2	6	13	13
8	2	2	2	6	13	13
16	2	2	2	6	13	13
24	2	2	2	6	13	13
32	2	3	3	10	19	20
40	3	5	5	17	32	36
48	5	7	7	30	48	56
56	7	10	10	44	66	78
64	10	14	13	60	84	101
72	13	18	18	77	103	122
80	17	23	23	94	121	148
88	22	29	28	115	139	168
96	26	34	34	135	156	187
104	31	41	42	152	171	208
112	37	48	48	171	186	225
120	42	56	54	186	198	239
128	50	64	63	201	208	253
136	55	73	71	215	219	255
144	63	82	83	229	225	255
152	70	91	89	241	232	255
160	78	100	102	252	238	255
168	85	109	107	255	243	255
176	93	115	118	255	246	255
184	101	125	128	255	248	255
192	109	134	137	255	251	255
200	116	144	147	255	254	255
208	127	152	155	255	255	255
216	135	163	166	255	255	255
224	143	169	173	255	255	255
232	146	172	175	255	255	255
240	146	172	175	255	255	255
248	146	172	175	255	255	255