From wiktionary :
Etymology
New Latin, from camera, chamber, + obscura, dark.
Noun
camera obscura (plural camera obscuras)
You can find example of usage in wikipedia page :
Most practical camera obscuras use a lens rather than a pinhole (as in a pinhole camera) because it allows a larger aperture, giving a usable brightness while maintaining focus.
This is a book in references :
- Smith, Roger. "A Look Into Camera Obscuras". Retrieved 2014-10-23.
There is a website :
Cameraobscuras.com George T Keene builds custom camera obscuras like the Griffith Observatory CO in Los Angeles.
And this is also a category : Camera_obscuras
The funny part is that camera in english came from this.