Sony A7C II + TTArtisan 40mm F2

Sony A7C II jpegraw 44 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.

0.218

MTF50 center

0.268

MTF50 mid

0.230

MTF50 corner

data table

cycles / stimulus px	center 0.22	mid 0.27	corner 0.23
0.00	1.00	1.00	1.00
0.02	0.99	0.99	1.00
0.05	0.97	0.96	0.97
0.07	0.94	0.93	0.93
0.09	0.90	0.90	0.89
0.11	0.83	0.86	0.84
0.14	0.75	0.81	0.78
0.16	0.67	0.75	0.71
0.18	0.60	0.69	0.64
0.20	0.53	0.63	0.57
0.23	0.48	0.57	0.50
0.25	0.41	0.51	0.43
0.27	0.33	0.46	0.36
0.30	0.26	0.41	0.30
0.32	0.21	0.37	0.25
0.34	0.17	0.33	0.20
0.36	0.14	0.30	0.16
0.39	0.10	0.28	0.13
0.41	0.07	0.26	0.11
0.43	0.04	0.25	0.09
0.45	0.03	0.25	0.08
0.48	0.03	0.24	0.06
0.50	0.01	0.24	0.06

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	1	2	2	5	12	12
8	1	2	2	5	12	12
16	1	2	2	5	12	12
24	1	2	2	5	12	12
32	2	2	3	8	16	18
40	3	4	4	15	27	32
48	4	6	6	24	41	50
56	6	9	8	37	56	69
64	9	12	11	52	73	89
72	11	15	15	67	89	111
80	14	19	19	84	105	132
88	18	23	23	102	123	152
96	22	28	28	118	140	173
104	27	34	34	137	156	193
112	31	40	40	154	172	211
120	37	46	46	170	186	227
128	43	53	53	185	199	241
136	48	60	61	200	209	254
144	54	68	69	213	219	255
152	61	76	77	227	226	255
160	69	85	86	239	232	255
168	75	92	94	249	238	255
176	83	100	103	255	241	255
184	89	109	112	255	245	255
192	97	119	121	255	248	255
200	104	128	132	255	251	255
208	113	136	140	255	254	255
216	123	147	149	255	255	255
224	132	156	159	255	255	255
232	134	158	161	255	255	255
240	134	158	161	255	255	255
248	134	158	161	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	0.94
0.50	0.85
0.70	0.74
0.88	0.66

Veiling glare (haze)

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

0.42%

veiling glare · raw (n=2)

0.79%

veiling glare · jpeg (n=2)

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	1	2	2	5	12	12
8	1	2	2	5	12	12
16	1	2	2	5	12	12
24	1	2	2	5	12	12
32	2	2	3	8	16	18
40	3	4	4	15	27	32
48	4	6	6	24	41	50
56	6	9	8	37	56	69
64	9	12	11	52	73	89
72	11	15	15	67	89	111
80	14	19	19	84	105	132
88	18	23	23	102	123	152
96	22	28	28	118	140	173
104	27	34	34	137	156	193
112	31	40	40	154	172	211
120	37	46	46	170	186	227
128	43	53	53	185	199	241
136	48	60	61	200	209	254
144	54	68	69	213	219	255
152	61	76	77	227	226	255
160	69	85	86	239	232	255
168	75	92	94	249	238	255
176	83	100	103	255	241	255
184	89	109	112	255	245	255
192	97	119	121	255	248	255
200	104	128	132	255	251	255
208	113	136	140	255	254	255
216	123	147	149	255	255	255
224	132	156	159	255	255	255
232	134	158	161	255	255	255
240	134	158	161	255	255	255
248	134	158	161	255	255	255

stimulus level	R raw	G raw	B raw	R jpg	G jpg	B jpg
0	1	2	2	5	12	12
8	1	2	2	5	12	12
16	1	2	2	5	12	12
24	1	2	2	5	12	12
32	2	2	3	8	16	18
40	3	4	4	15	27	32
48	4	6	6	24	41	50
56	6	9	8	37	56	69
64	9	12	11	52	73	89
72	11	15	15	67	89	111
80	14	19	19	84	105	132
88	18	23	23	102	123	152
96	22	28	28	118	140	173
104	27	34	34	137	156	193
112	31	40	40	154	172	211
120	37	46	46	170	186	227
128	43	53	53	185	199	241
136	48	60	61	200	209	254
144	54	68	69	213	219	255
152	61	76	77	227	226	255
160	69	85	86	239	232	255
168	75	92	94	249	238	255
176	83	100	103	255	241	255
184	89	109	112	255	245	255
192	97	119	121	255	248	255
200	104	128	132	255	251	255
208	113	136	140	255	254	255
216	123	147	149	255	255	255
224	132	156	159	255	255	255
232	134	158	161	255	255	255
240	134	158	161	255	255	255
248	134	158	161	255	255	255

stimulus level	R raw	G raw	B raw	R jpg	G jpg	B jpg
0	1	2	2	5	12	12
8	1	2	2	5	12	12
16	1	2	2	5	12	12
24	1	2	2	5	12	12
32	2	2	3	8	16	18
40	3	4	4	15	27	32
48	4	6	6	24	41	50
56	6	9	8	37	56	69
64	9	12	11	52	73	89
72	11	15	15	67	89	111
80	14	19	19	84	105	132
88	18	23	23	102	123	152
96	22	28	28	118	140	173
104	27	34	34	137	156	193
112	31	40	40	154	172	211
120	37	46	46	170	186	227
128	43	53	53	185	199	241
136	48	60	61	200	209	254
144	54	68	69	213	219	255
152	61	76	77	227	226	255
160	69	85	86	239	232	255
168	75	92	94	249	238	255
176	83	100	103	255	241	255
184	89	109	112	255	245	255
192	97	119	121	255	248	255
200	104	128	132	255	251	255
208	113	136	140	255	254	255
216	123	147	149	255	255	255
224	132	156	159	255	255	255
232	134	158	161	255	255	255
240	134	158	161	255	255	255
248	134	158	161	255	255	255