A disposable lens glued onto a micro four thirds camera body cap. It is fixed focus, with the focus starting around 1~2 meters. Of course, you can change that with a macro converter tube :-). The photographs below were taken with the adapted lens on a 10 and 16mm Meike macro extensions. I didn't (still don't, as of writing) have a proper macro lighting setup, so these were illuminated with a bright LED torch. You can see from the ISO used that this did much less than you would think! My cat was also pretty displeased with my shining a light on her when she was just trying to nap 😬.
A cat's inner ear hair
Macro photograph of a cat's inner ear hair
A cat's inner ear hair
Description: Macro photograph of a cat's inner ear hair
Camera: Olympus E-M5 III
Lens: Kodak 30mm f/10
Aperture: f/10
Shutter speed: 1/100s
ISO: 6400
A cat's outer ear hair
Macro photograph of a cat's outer ear hair
A cat's outer ear hair
Description: Macro photograph of a cat's outer ear hair
Camera: Olympus E-M5 III
Lens: Kodak 30mm f/10
Aperture: f/10
Shutter speed: 1/100s
ISO: 6400
A cat's eye
Macro photograph of a cat's eye
A cat's eye
Description: Macro photograph of a cat's eye
Camera: Olympus E-M5 III
Lens: Kodak 30mm f/10
Aperture: f/10
Shutter speed: 1/25s
ISO: 6400
Sourdough bread crust
Macro photograph of sourdough bread crust
Sourdough bread crust
Description: Macro photograph of sourdough bread crust