PHOTOGRAPHY -12
ZOOM LENSES
People are quite familiar with the term zoom lens and
is understood as ‘capable of zoom in or zoom out’ the image.This means that any
object is ‘drawn inward magnifying the features there in or drawn out
progressively diminishing in details and in image size.
The most significant feature of a zoom lens is
“variable focal length’ of the lens to perform image magnification from the same camera position. In plain terms
–a lens of an appropritae focal length limits [as low end /high end ] can
successfully focus the image over a range ; so at its lower end, it functions
as Wide angle [or at least towards WA]
and at its far end , functions asTelephoto [or at least towards Tele].
Therefore zoom lenses are like 3 in one [WA/ T/ Zoom] systems-ready to adapt to
needs .
From a technical stand point , Zoom lenses are of varied variable focal lengths such as 18
-55, 70 -200 , 100-800, 200-500 and as an extreme – 10-24; The last of these is
a Zoom wide angle, while the earlier ones are Zom tele lenses .
Literally, the photographer enjoys ample freedom of
both choice and execution of image magnification as to easily satisfy clarity
of details or due prominence in the primary image itself.
“Zooming “ offers the innate advantage of sustaining
focus even as the image of the object is zoomed in. Taking advantage of this,
Cinematographers use zoom lens to alternately focus on to 2 different persons
sepatated by a fair distance between them, though the camera stays in place
nearly anchored.
Playing up the ‘feel’ of depth in a picture or footage
has always been a dream for all technicians-be it Still photo or movie. A simple starategy practised has been to use
a cluster of flowers or leaves hand-held just inches from the lens that is already
focussed for a distant object . The flower/leaf bunch-murky in clarity,
enhances the feel of distance as objects at a distance are clear in details.
Though a Zoom lens offers instant object magnification
for ‘importance’ or prominence, indoor photography would throw up a challenge
of ‘acceptable lighting’ ????
To continue …..
Prof. K.Raman
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