Originally Posted by
Jack Dahlgren
For a 55mm focal length, extend the bellows 55mm from the focal plane.
The commercially made pinholes are pretty expensive. I've built my own using the following process.
Get a sheet of brass shim stock from a hobby shop.
Place it on a firm surface and using something with a rounded end and a hammer, make a small dimple in the center of it. This is just to thin the metal a bit more.
Using fine sandpaper, sand the back of the metal until the back of the dimple is flat with the rest of the metal.
Using a sharp needle, tap the needle in the center of the dimple until it goes through the metal.
Remove the needle and again using the sandpaper (400 grit would work well) sand the back of the metal to remove any burrs.
Finally using the needle in hand. Put it lightly into the hole and rotate it from both the front and rear sides to ensure a nice round hole.
Using black photo tape, tape this over the hole in any lensboard that fits your camera.
You can make a shutter with a flap of the same tape.
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