pinhole lens for EOS

35mm pinhole lens for Canon EOS (EF lens mount). Designed to place the pinhole as close to the sensor as possible, thus maximizing aperture. No need to use glue or tape to fix the aluminium with the pinhole, a washer holds it (if it is too lose 

Follow any regular instructions for creating the aluminium foil (or any other material)  pinhole, such as:
https://www.wikihow.com/Make-a-Pinhole-Lens-for-Your-SLR-Camera
https://digital-photography-school.com/make-pinhole-camera-dslr-body-cap/

But then again you don't need to get (and destroy) a camera cap, nor you need tape or glue, the washer holds the foil. It even has a small notch to remove it if you want to replace the foil, and, for instance, use different pinhole sizes.

If the washer is too loose, or doesn't fit, try printing it at 101% or 99% dimensions.

Print it with supports. I choose to require supports on the external part of the lens so the part that goes into the camera is smooth and clean.

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With this lens you take very long exposure photos, the results are “creamy” or “foamy”, and the focus is equally spread across distances (large depth of field).