PINHOLE SIZE TO FOCAL LENTH
These values are based
on the Pinhole Resource information.
| comments |
Pinhole (mm) |
FL(mm) Resource |
F# |
| EMSci grid |
0.075 |
4 |
56 |
| EMSci grid |
0.100 |
8 |
75 |
| EMSci grid |
0.150 |
17 |
113 |
| EMSci grid |
0.300 |
68 |
225 |
| sewing needle #13 |
0.305 |
70 |
229 |
| hobby drill #80 |
0.343 |
88 |
257 |
| sewing needle #12 |
0.356 |
95 |
267 |
| hobby drill #79 |
0.368 |
102 |
276 |
| EMSci grid |
0.400 |
120 |
300 |
| hobby drill #78 |
0.406 |
124 |
305 |
| hobby drill #77 |
0.457 |
157 |
343 |
| sewing needle #10 |
0.457 |
157 |
343 |
| hobby drill #76 |
0.508 |
194 |
381 |
| hobby drill #75 |
0.533 |
213 |
400 |
| sewing needle #9 |
0.533 |
213 |
400 |
| hobby drill #74 |
0.572 |
245 |
429 |
| EMSci grid |
0.600 |
270 |
450 |
| hobby drill #73 |
0.610 |
279 |
457 |
| sewing needle #8 |
0.610 |
279 |
457 |
| hobby drill #72 |
0.635 |
302 |
476 |
| hobby drill #71 |
0.660 |
327 |
495 |
| sewing needle #7 |
0.686 |
353 |
514 |
| hobby drill #70 |
0.711 |
379 |
533 |
| hobby drill #69 |
0.742 |
413 |
556 |
| sewing needle #6 |
0.762 |
435 |
572 |
| hobby drill #68 |
0.787 |
465 |
591 |
| EMSci grid |
0.800 |
480 |
600 |
| hobby drill #67 |
0.813 |
495 |
610 |
| hobby drill #66 |
0.838 |
527 |
629 |
| sewing needle #5 |
0.851 |
543 |
638 |
| hobby drill #65 |
0.889 |
593 |
667 |
| hobby drill #64 |
0.914 |
627 |
686 |
| hobby drill #63 |
0.940 |
662 |
705 |
| hobby drill #62 |
0.965 |
699 |
724 |
| hobby drill #61 |
0.991 |
736 |
743 |
| EMSci grid |
1.000 |
750 |
750 |
Microdrill bits from McMaster [PDF] allow for some intermediate sizes. I have never actually tried these. Expensive if they break easily. Might be best to use a drill press to avoid lateral movement that would break the bit. Only for soft metals like copper, brass, aluminum. |