3D-printed Digital Camera Obscuras

In photography, it's usually the case that the larger the film or sensor, the better. Large-format film is a pain to deal with, but large-format sensors are extremely expensive. Fortunately, most of the properties of a large format sensor can be obtained by building a camera obscura that projects an image onto a relatively large screen, which we simply photograph using a small-sensor digital camera. Our particular obscura is of the rear projection type, which means that the obscura's lens and our digital camera are on opposite sides of the screen. This thing is a collection of parts for 3D-printed digital camera obscuras that use your compact digital camera (especially ones similar to the Canon PowerShot ELPH 180) or cell phone to capture the image projected on a large-format screen... and can cost less than $25 to make (including the lens).

Such devices are often generically called depth-of-field adapters because they can produce images in which the subject is reasonably sharp, but