Magazine : 
The Journey of Cameras: From Obscura to Smartphone
3. Twin Lens Reflex Camera
Twin Lens Reflex or Double lens cameras were first developed around 1870. This type of cameras has two objective lenses of same focal length. The first lens is for the photographic view by which photographer view the image and another one for focusing the image.
4. Dry plate in 1871
With the invention of dry plate, it has improved the quality of images and the photographic exposure time was shortened. This new process simplified the work of photographers and helped them to take more photos. Dry plates are improved type of photographic plates invented by Dr. Richard Maddox in 1871.
