Basics
The AF-S Zoom-Nikkor 17-35 mm f/2.8D IF-ED (to use its full name) covers an angle of view of 79 - 44 degrees on a DX sensor and incorporates a Silent Wave motor for fast, silent autofocus. Two types of aspheric lens element are included in the optical design to control distortion as well as Extra-low Dispersion glass elements to reduce chromatic aberration and increase resolution and contrast control. The remaining elements are specified to include Super Integrated Coatings to aid colour reproduction and minimize ghosting and flare.
The Internal Focussing (IF designation) allows the lens to be focussed down to a fantastic 0.28 m from the film plane (around 12 cm from the front of the lens) enabling dramatic compositions to be made. The AF-S allows manual focussing to be applied at any time - even when the AF servo is in operation resulting in great user control over selective focus and as you'd expect no power is required during manual focussing so there's a respite for the camera battery. The construction is very solid and designed to be water and dust "resistant" - despite constant use over many years mine has stood up well to the egress of dust.
Why wide angle is so suited to documentary photography
The angle of view created with wide focal lengths is traditionally associated with documentary subjects for good reason. The wide field of view allows you to work in close proximity while still capturing a large proportion of the background which is often essential in contextualising the main subject and creating a story-telling narrative that can be the main aim of a documentary image. By working close to the subject you're able to interact with people and can stay connected to how a situation is developing allowing you to anticipate the action and how the scene will develop. The wide angle of view also allows you to rapidly open up the scene by stepping back to include a large proportion of surrounding detail.
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