about cameras

1. Presented by:
Faiza Qazi

2. There are many different types of camera
including
1. Film
2. Digital
3. Compact
4. Single-lens reflex
5. Disposable
6. Instant-picture
7. Large format

4.  A digital camera captures images electronically
rather than on standard film stores them on
removable memory cards. Images can then be
transferred to a computer and printed out or
sent over internet.

5.  Some digital cameras can be connected directly
to printers in order to print out photos, and
many printers have slots for memory cards to
be inserted. This makes transferring images to
a computer unnecessary.

6.  The Polaroid “instant-picture” camera uses
slim envelopes of plastic instead of a roll of
film. Inside is a sheet of film and a pod of
chemicals that bursts to process the picture in
just 90 seconds.

7.  The single-lens reflex (SLR) camera may use
either film or a digital sensor. It is popular with
photographers for its versatility, and because
the viewfinder shows exactly the same view
that the camera will record. The lens can be
interchanged with others to give a wide view
or to magnify the subject.

8.  In early cameras, the lens was focused by
moving a bellows-a concertina-like cloth
tunnel-in and out. Many photographers still
use large-format bellows cameras for high
quality studio work.

10. The first photograph was taken only about 180 yrs ago.
Hundreds of yrs ago, the Chinese found that light
entering a dark room through a pinhole would
project a fuzzy image of the world outside onto the
opposite wall. Many yrs later, in 1500 in Europe, a
room like this was called a camera obscure, which is
Latin for “darkened room”. In the 17th century some
artists drew sketches with the aid of a camera
obscure which had a lens instead of a pinhole to
make the image sharper and brighter. The discovery
of chemicals that darkened when exposed to light
finally made it possible to fix the image permanently-
on paper, on glass plates, or on film.

12.  Today, digital cameras use light-sensitive electronic
sensors instead of film. Sophisticated electronic
technology in most cameras ensures that each picture
gets the right amount of light and imperfectly sharp.