focal-length lenses used with 35mm SLR cameras.
another film format and focal-length combination.
camera is 19 degrees. To match the angle of view
needed. The normal focal-length lens (50mm) for a
35mm camera provides an angle of view of 40 degrees
(width). You can see from the table that the normal
focal-length lens for a medium format camera
(2 1/4" x 2 1/4") is an 80mm lens because it provides
approximately the same angle of view (38 degrees).
used for different photographic applications. The types
we are speaking of the lens focal length as it applies to
35 mm cameras.
a large area. Wide-angle lenses have their own qualities,
causing apparent, repeat, apparent, distortion and
foreshortening of perspective, so objects close to the
this focal length allows the typical wide-angle effects
without introducing apparently distorted images, such
as bent walls. As well as providing a wider field of view,
wide-angle lenses also produce great depth of field at all
points allowed by wide-angle lenses can cause
perspective effects that appear distorted but are
perfectly natural ways of seeing objects at close range.
with a wide-angle lens, you must move in close. This
causes a distorted view. But wide-angle lenses can be
used when special effects are desired, such as deliberate
distortion, when exaggeration of features or when
surrounding areas add to the viewer's understanding of
lens. Strong light can easily cause flare when reflected
internally between the elements of the lens, and unless
you take proper precautions by using a lens hood, your
pictures may be spoiled. Sometimes you are able to see
flare or ghosting in the viewfinder, but more often than
not, it is not visible to the human eye, and it only shows
up on the processed film.
Basic Photography Course