Saturday, June 15, 2013

Nikon D800/E AF sensor accuracy

Nikon D800/E AF sensor accuracy

Nikon D800/E outer AF sensor accuracy

LumoLabs: Nikon D800/E outer AF sensor accuracy

Nikon and Thom Hogan say we are using the wrong test pattern
Just not understanding non cross-type AF sensors limitations

Archive 2012 · question about D4/D800 autofocus cross-type point layout

Advanced Multi-CAM 3500FX autofocus sensor module
Accurate AF detection is crucial for extremely high-resolution still images in every situation. The 51 sensor points in the Nikon D800’s AF sensor module work down to -2 EV (ISO 100, 20°C/68°F), the approximate physical limit of human visibility through an optical viewfinder. For even more powerful detection, you can rely on the camera’s 15 cross type sensors in the centre to detect both vertical and horizontal lines when using any AF NIKKOR lenses of f/5.6 or faster. What’s more, AF can be activated with eleven focus points in the centre with open aperture of f/8, which is a big plus when you combine a telephoto lens with a 2.0x teleconverter to shoot distant subjects.

Versatile AF-area modes
Whether it’s a still life, a portrait, a landscape or a candid street scene, your subject matter varies, but its importance doesn’t. That’s why the Nikon D800 offers four AF-area modes, each specifically tailored to adapt to various subjects. Single-point AF is ideal when you need pinpoint focus on stationary subjects. Dynamic-area AF has three options (9-point, 21-point and 51-point) and is ideal for shooting moving subjects. The selected AF point and the surrounding points keep your subject in sharp focus even if it briefly leaves the selected points. 3D-tracking allows you to maintain focus on subjects that are moving erratically from side to side. Auto-area AF detects human faces and prioritises their sharpness for you — an ideal choice for candid photography.

Advanced Scene Recognition System with 91K-pixel RGB sensor
Nikon’s revolutionary Advanced Scene Recognition System, introduced with the flagship Nikon D4 camera, is also employed in the Nikon D800. At its core is a 91K-pixel RGB sensor that meticulously analyses each scene with fine resolution. The RGB sensor can recognize your scene’s colours and brightness with unprecedented precision then use that information to implement various automatic controls and give you more natural-looking results. The real breakthrough, however, is that the sensor can detect human faces with startling accuracy when shooting through the optical viewfinder. Along with face detection, detailed scene analysis is utilised to support more accurate auto-focus; auto exposure and i-TTL flash exposure results in a diverse range of compositional and lighting situations. The improved subject tracking is most noticeable when using 3D-tracking, which can maintain a focus on moving subjects smaller in size than with previous generations.


Zaklady spravneho ostreni - DSLR


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