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Focal length Best aperture diameter Equivalent f-stop Exposure factor for f/22 50 Mm 0.29 mm f/174 63 x 75 mm 0.35 mm f/213 94 x 100 mm 0.41 mm f/246 125 x 125 mm 0.45 mm f/275 157 x 150 mm 0.50 mm f/203 188 x 200 mm 0.57 mm f/348 250 x 250 mm 0.64 mm f/389 313 x 300 mm 0.70 mm f/426 376 x
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Focal length (mm)	Pinhole diameter (mm)	f-stop
130	0.33	380
210	0.40	500
260	0.46	550
320	0.50	650
420	0.58	690
550	0.66	800
650	0.74	930
750	0.79	960
1000	0.91	1120

Focal length (mm)	Pinhole diameter (mm)	f-stop	Exposure factor for f/16
10	0.14	70	20
20	0.20	100	40
30	0.24	125	60
40	0.28	140	80
50	0.31	160	100
60	0.34	180	125
70	0.37	190	140
80	0.40	200	160
90	0.42	214	180
100	0.45	220	190
150	0.54	280	300
200	0.63	318	400
250	0.70	360	500
300	0.78	380	560
350	0.84	418	700
400	0.89	450	800

Focal length (mm)	Pinhole diameter (mm)	Approx. f-stop
50	0.26	200
75	0.32	220
100	0.45	240
150	0.55	270
200	0.63	320
250	0.71	350
300	0.77	390
350	0.83	420
400	0.89	450
500	1.00	500

Focal length (mm)	Pinhole diameter (mm)	f-stop
130	0.33	380
210	0.40	500
260	0.46	550
320	0.50	650
420	0.58	690
550	0.66	800
650	0.74	930
750	0.79	960
1000	0.91	1120

Focal length (mm)	Pinhole diameter (mm)	Approx. f-stop
50	0.26	200
75	0.32	220
100	0.45	240
150	0.55	270
200	0.63	320
250	0.71	350
300	0.77	390
350	0.83	420
400	0.89	450
500	1.00	500
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