1. Daguerreotype- A photograph taken by
an early process employing an iodine-
sensitized silvered plate and mercury
vapour.
This type of photography was one of the first most successful types of photography. It was
invented but Louis-jaques-mande Daguerre, in1837, a French artist and scenic painter.
Daguerre continued to experiment with copper plates coated with silver iodide to produce
direct positive pictures. Daguerre discovered that the hidden image on an exposed plate
could be brought out or "developed". Daguerre began making successful pictures using his
improved process from 1837. On 19th August,1839, at a meeting in Paris,
the Daguerreotype Process was revealed to the world.
Polaroid-Edwin Land invented the polaroid camera also
specialized in working with polarized light. He temporarily left
school and open a laboratory to apply his research to light
filters, optical devices and motion-picture processes.The idea of instant photography actually
came from Land's daughter, who wondered why developing photos took so long. Land
decided to take the entire process of developing a print from a negative and combining it in
one sheet. He made both print and negative the same size and included a packet of
chemicals that would be activated when the film was advanced. When the film was removed
from the camera by hand, the chemicals would
spread evenly over the negative to develop the
picture.

2. Digital-Digital camera technology is directly related to and evolved from the same technology
that recorded televisionimages. In 1951, the first Video Tape recorder recorded live action.
Most cameras sold today are digital. : Kodak announces the development of the world's first
megapixel digital sensor small enough to function in a handheld camera, a sensor that had
1.4 million pixels. 1990: Olympus shows a prototype version of their still digital camera