[Multi-function Wireless Signal Detector] 1. Wireless Pinhole Camera detector detects the camera with an infrared laser and makes use of a special filter attached to the device for observation.

[ChickenCrimpy] adds the most basic of 35 mm cartridge to create what he calls the Minimum Viable Camera. It’s a half-frame 35 mm pinhole film camera with the simplest possible construction.

Cameras with pinhole lenses that can be easily concealed ... While the untrained eye might not be familiar with how to find hidden cameras, there are some things you can do to reduce your risk.