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Stainless Steel 10 Sizes PackThis sample pack includes 10 pins of each of the 10 sizes we offer in stainless steel; see which ones work best for you before buying hundreds. Besides pinning insects, these pins are tools for use in teaching physics of optics. Use them to make pinhole cameras & find which sized aperture works best. Read our Blog on 10 Things You Can do with Insect Pins. |
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Suggested Pin Diameters for Optimal Focus (focal length) for Pinhole Cameras
|
Focal Length cm
|
Focal Length in.
|
Pin Size
|
Pin Diameter mm
|
|
3.5
|
1 ¼
|
000
|
0.25
|
|
5.6
|
2
|
00
|
0.30
|
|
6.9
|
2 ½
|
0
|
0.35
|
|
9.0
|
3 ½
|
1
|
0.40
|
|
11.4
|
4 ½
|
2
|
0.45
|
|
14.1
|
5 ½
|
3
|
0.50
|
|
17.0
|
6 ½
|
4
|
0.55
|
|
20.2
|
8
|
5
|
0.60
|
|
23.4
|
9
|
6
|
0.65
|
Focal Length as defined here is the distance from the pinhole at the front of the camera to rear where the photographic film or paper is placed.
This is the distance of best theoretical focus of the pinhole camera’s image with a pinhole of particular diameter. Note: The actual pinhole size/aperture made with a particular pin will likely be slightly larger than the diameter of the pin shaft.
A small diameter pinhole has a shorter effective focal length; however smaller diameter pinholes will also require longer exposure times than larger pinholes. Depending on your photographic/artistic goals (ultra-sharp focus may not be required, or even desired) you may wish to choose a larger pinhole and give up some sharpness for faster more practical exposure times.
Information provided courtesy of Dan Pickard, Seattle WA
