1. The Iris, Lens and Retina of the eye work similarly to the Film, Iris and Lens of a camera. They both are responsible for taking in light and turning it into the images we see.
2. The image is formed by light entering the darkroom and being exposed to the film (or retina) which forms an image that is flipped. The sharpness of the camera obscura is dependent on how still the things being photographed stay, and the exposure time.
3. A Camera Obscura has a lens, while a pinhole camera does not.
4. The chamber must be completely dark, and the hold has to be very small. Also, make sure that you have a shutter that covers the pinhole.
5. Light enters the pinhole and projects an inverse image on the opposite side of the box or chamber.
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