If you already have a Microscope Objective adapter, you only need the PLA part. Select "PLA-Lens Only" option to omit the metal parts and save cost

The PLA part is now offered as an option of the metal microscope adapter: https://www.tindie.com/products/mbe2001/metal-microscope-macro-set-for-sony-and-more/

What is it?

A modular pinhole lens, consisting of:

1. A Carbon Fiber PLA body having an RMS thread.
2. A 0.3mm hole in a brass plate.
3. A metal 1x20mm or 2x20 extension tube.
4. An inner Matte PLA sleeve to reduce reflection.
5. A metal Camera adapter.
6. A metal thread adapter.

Camera and tripod are for visualization and are not included.

Options

1. PLA lens ONLY (No metal parts).
2. Select 1x20mm or 2x20mm extension tube.
3. Airbrush the inner surfaces of the PLA parts with primer and Musou Black - the blackest paint available in the market today. Musou Black is needed only for HDR application (e.g. following the sun*), the images above were taken without Musou Black, and with bare brass pinhole (not blackened). Cost is mostly due to labor involved (paint is expensive, but only a small amount is needed).

Why did you make it?

Pinhole lenses are fun. However, working with one usually requires building a box and developing photo paper in a darkroom they. This lens can be used with a digital camera.

What makes it special?

1. The lens is modular, allowing multiple focal lengths.
2. Inner PLA sleeve reduces unwanted reflections, especially if painted with Musou Black.
3. RMS thread is interchangeable with a microscope Objective Thread. Thus if you already have an adapter, then only the PLA part is needed (cost saving).

Focal length for Different cameras (Do not use with C-MOUNT cameras - the sensor size if too small).

The pinhole size of 0.3mm is optimal for f=67mm, and the f# is 223.

Important: Pinhole imaging using a digital Camera.

Pinhole Cameras have infinite depth of field, have zero geometric distortion, and have very large f# making them suitable to image very bright objects (e.g., the Sun*) However, the image for ANY pinhole lens used on a digital camarea will be VERY blurred and need to be significantly reduced by size by a factor of approximately 8 to 12 to get a reasonable image - which will still be soft, like the example images on this page.

The reason is that even for the optimal pinhole size, the blur will be the size of the pinhole 0.3mm in this case. For a 5 micron pixel size that is 60 times larger than the pixel size. The pinhole size cannot be made much smaller, because the diffraction blur will increase. For a 0.3mm pinhole size the diffraction blue equal the geometric blur (= pinhole size) at 67 mm, which is the optimal focal length for this pinhole size.

Images above were reduced from 3008 pixels to 400 pixels. Photoshop "Levels" and "Unsharp-Mask" were used to enhance the images. Using Levels is recommended, using "Unsharp Mask" is a matter of personal taste

* WARNING: DO NOT** look at the directly at the sun through the view finder of any camera.