A custom built camera is a photography tool that is constructed from individual components rather than purchased as a pre-assembled unit. This allows for a greater degree of customization and control over the final product. One of the key benefits of building a camera from scratch is the ability to select and combine the best components to suit the individual needs and preferences of the photographer. For example, a professional photographer might prioritize a high-resolution sensor, while a landscape photographer might value a large aperture lens. Additionally, building a camera from scratch allows for a deeper understanding and appreciation of the inner workings of the device, and can be a rewarding and educational experience for the builder. However, it's also important to note that building a camera from scratch can be a time-consuming and technically challenging task, requiring a significant investment of time and resources. and depending of the level of customization and parts used, can be costly as well.