Автор: ShotlandetsaWildlife
Дата: 26-09-09 22:49
Photographers have grown accustomed to using auto-focus systems in their day to day work and we see increasingly higher numbers of focus points advertised in each new wave of AF products. The term “multi-point auto-focus” is a bit misleading, however, for cameras with sensors larger than APS. Due to the physics of an SLR-camera, the off-center focus points that are offered are all clustered relatively close to the center of the image. To set focus outside of this center area, the photographer is still forced to focus first, and then shift the camera to reframe, with the resulting loss of focus as a result.
To overcome this problem, we have used modern yaw rate sensor technology to measure angular velocity in an innovative way. The result is the new Absolute Position Lock (APL) processor, which forms the foundation of our True Focus feature. The APL processor accurately logs camera movement during any re-composing, then uses these exact measurements to calculate the necessary focus adjustment, and issues the proper commands to the lens’s focus motor so it can compensate. The APL processor computes the advanced positional algorithms and carries out the required focus corrections at such rapid speed that no shutter lag occurs. The H4D’s firmware then further perfects the focus using the precise data retrieval system found on all HC/HCD lenses.
аз така или иначе рядко го ползвам но за повечето про-та това е радостна новина, особено при 60 мегапиксела.
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