macro bellows.com - Close Up Exposure / Magnification Tables for macro photography

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Close Up Exposure / Magnification Tables

These Close Up Exposure / Magnification Tables are for lenses of focal lengths including 50mm, 80mm, 100mm and 135mm. The tables show the exposure factor which needs to be multiplied by the metered exposure to determine the exposure increase when using non-TTL metering cameras or flash. These tables can be used for photographs taken using bellows or extension tubes.

For lenses of 50mm focal length

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Extension increase (z)
Subject distance (a)
Image distance(a')
Total distance (a+a'=e)

Scale of reproduction (b')

Subject area (f/g)

Exposure factor (v)
mm
mm
mm
mm
mm
mm
mm
0
inf
50
inf
different
variable
1.2
5
550
55
605
0.1
240x360
1.4
10
300
60
360
0.2
120x180
1.6
15
217
65
282
0.3
80x120
1.7
20
175
70
245
0.4
60x90
2.0
25
150
75
225
0.5
48x72
2.3
30
133
80
213
0.6
40x60
2.6
35
121
85
206
0.7
34x51
2.9
40
113
90
203
0.8
30x45
3.2
45
106
95
201
0.9
27x40
3.6
50
100
100
200
1.0
24x36
4.0
60
92
110
202
1.2
20x30
4.8
70
86
120
206
1.4
17x26
5.8
80
81
130
211
1.6
15x23
6.8
90
78
140
218
1.8
13x20
7.8
100
75
150
225
2.0
12x18
9.0
110
73
160
233
2.2
11x16
10.2
120
71
170
241
2.4
10x15
11.6
130
69
180
249
2.6
9x14
13.0
140
68
190
258
2.8
9x13
14.4
150
67
200
267
3.0
8x12
16.0
160
66
210
276
3.2
8x11
17.6
170
65
220
285
3.4
8x11
19.4
180
64
230
294
3.6
7x10
21.2
190
63
240
303
3.8
6x9
23.0
200
63
250
313
4.0
6x9
25.0
210
62
260
322
4.2
6x9
27.0
220
61
270
331
4.4
5x8
29.0

 

For lenses of 80mm focal length

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Extension increase (z)
Subject distance (a)
Image distance(a')
Total distance (a+a'=e)

Scale of reproduction (b')

Subject area (f/g)

Exposure factor (v)
mm
mm
mm
mm
mm
mm
mm
0
inf
80
inf
different
variable
1.0
5
1360
85
1445
00.6
392x576
1.1
10
720
90
810
0.12
192x288
1.3
15
507
95
602
0.19
127x192
1.4
20
400
100
500
0.25
96x144
1.6
25
336
105
441
0.31
77x115
1.7
30
294
110
404
0.38
64x96
1.9
35
263
115
378
0.44
55x82
2.1
40
240
120
360
0.50
48x72
2.3
45
222
125
347
0.56
43x64
2.5
50
208
130
338
0.62
38x58
2.7
60
186
140
326
0.75
32x48
3.1
70
171
150
321
0.88
27x41
3.5
80
160
160
320
1.00
24x36
4.0
90
151
170
321
1.12
21x32
4.5
100
144
180
324
1.25
19x29
5.0
110
138
190
328
1.38
17x26
5.6
120
133
200
333
1.50
16x24
6.2
130
129
210
339
1.63
15x22
6.9
140
126
220
346
1.75
14x21
7.6
150
123
230
353
1.87
13x19
8.3
160
120
240
360
2.00
12x18
9.0
170
118
250
368
2.12
11x17
9.8
180
116
260
376
2.25
11x16
10.6
190
114
270
384
2.38
10x15
11.4
200
112
280
392
2.50
10x14
12.3
210
110
290
400
2.63
9x14
13.2
220
109
300
409
2.75
9x13
14.1

 

For lenses of 100mm focal length

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Extension increase (z)
Subject distance (a)
Image distance(a')
Total distance (a+a'=e)

Scale of reproduction (b')

Subject area (f/g)

Exposure factor (v)
mm
mm
mm
mm
mm
mm
mm
0
inf
100
inf
different
variable
1.0
5
2100
105
2205
0.05
480x720
1.1
10
1100
110
1210
0.10
240x360
1.2
15
767
115
882
0.15
160x240
1.3
20
600
120
720
0.20
120x180
1.4
25
500
125
625
0.25
96x144
1.6
30
433
130
563
0.30
80x120
1.7
35
386
135
521
0.35
69x103
1.8
40
350
140
490
0.40
60x90
2.0
45
322
145
467
0.45
53x80
2.1
50
300
150
450
0.50
48x72
2.3
60
267
160
427
0.60
40x60
2.6
70
243
170
413
0.70
34x51
2.9
80
225
180
405
0.80
30x45
3.2
90
211
190
401
0.90
27x40
3.6
100
200
200
400
1.00
24x36
4.0
110
191
210
401
1.10
22x33
4.4
120
183
220
403
1.20
20x30
4.8
130
177
230
407
1.30
18x27
5.3
140
171
240
411
1.40
17x26
5.8
150
167
250
417
1.50
16x24
6.3
160
163
260
423
1.60
15x23
6.8
170
159
270
429
1.70
14x21
7.3
180
156
280
436
1.80
13x20
7.8
190
153
290
443
1.90
13x19
8.4
200
150
300
450
2.00
12x18
9.0
210
148
310
458
2.10
11x17
9.6
220
145
320
465
2.20
11x16
10.2

For lenses of 135mm focal length

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Extension increase (z)
Subject distance (a)
Image distance(a')
Total distance (a+a'=e)

Scale of reproduction (b')

Subject area (f/g)

Exposure factor (v)
mm
mm
mm
mm
mm
mm
mm
0
inf
135
inf
different
variable
1.0
5
3780
140
3920
0.04
600x900
1.1
10
1958
145
2103
0.07
343x514
1.2
15
1350
150
1500
0.11
218x327
1.2
20
1046
155
1201
0.15
160x240
1.3
25
864
160
1024
0.19
126x289
1.4
30
742
165
908
0.22
109x164
1.5
35
656
170
826
0.26
92x138
1.6
40
591
175
766
0.30
80x120
1.7
45
540
180
720
0.33
73x109
1.8
50
500
185
685
0.37
65x97
1.9
60
439
195
634
0.44
55x82
2.1
70
395
205
600
0.52
46x69
2.3
80
363
215
578
0.59
41x61
2.5
90
338
225
563
0.67
36x54
2.8
100
317
235
552
0.74
32x49
3.0
110
301
245
546
0.82
29x44
3.3
120
287
255
542
0.89
27x40
3.6
130
275
265
540
0.96
25x38
3.9
140
265
275
540
1.04
23x35
4.2
150
257
285
542
1.11
21x32
4.5
160
249
295
544
1.18
20x30
4.8
170
242
305
547
1.26
19x29
5.1
180
236
315
551
1.33
18x27
5.4
190
231
325
556
1.41
17x26
5.8
200
226
335
561
1.48
16x25
6.2
210
222
345
567
1.56
15x23
6.5
220
218
355
573
1.63
15x22
6.9

Macro Photography Technique

You will find everything you need to know about macro photography in our easy to follow technique guides to help you take great close ups.