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Focal length


The focal length is the distance between the centre of the lens and the film when an in-focus image of a far away object is formed.

Shibu Arakkal, a Bangalore based photographer recommends a wider focal length lens of 28 mm -- 105 mm to the 35mm -- 105mm one.

For example, in a room where space is a limitation, the 28 to 105 mm wide focal length lens would allow you to cover practically the whole room whereas a 35 mm lens would just photograph a portion of the room.

"Since both the lens (tele and wide angle) have a 105 mm zoom capability, they achieve the results of a 105 mm zoom lens. Thus, a 28 mm -- 105 mm lens is more versatile," adds Col Munshi.

Points to note:

~ A 28 mm lens has a greater "depth of field" than a 35 mm lens, which means objects closer to the camera as well as those at a distance, remain focused.
~Depth of field is the distance in front of and beyond the subject that appears to be in focus.
~The longer the focal length--35mm, 50mm or 105mm-- the smaller the "depth of field".

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