My history with frames and cameras. Started out with the standard kodak camera in my house during the 30s and 40s and early fifties. A cardboard frame with metal edges. It had a fixed lens with viewing through ground glass windows on the sides. Windows were approx. 2X3 proportion. My first camera was bought by my brother for my first class in photography taught by Ben Rose, in 1954 at Parson's School of Design. He insisted on these cameras: Rolliflex with Twin-Lens or less expensive Rollicord Twin-Lens or even less expensive Graphlex Twin-lens Made by the "press camera" large-format camera company. The Leica was the only 35 mm camera recommended. You must use one of these cameras and and he tested each and every lens in his studio to make sure they were perfect. The twin lens cameras used 2.25"X2.25" square film. I used this $125 graphlex camera until I bought a Canon 35mm camera and three lenses in 1989... 35 years of unusually sharp and always square pictures!
Now for 8 years I've used a Canon Sure Shot, digital camera. But for three years I use my iPOD camera! I guess it's 9x16 Golden rectangle proportion.