Автор: джъмбо
Дата: 23-06-12 15:58
до колкото помня практиката е показала, че канон това упражнение не го могат
за справка - даже при последният им топ модел това не го може
New 61-Point High Density Reticular AF
The EOS-1D X includes a brand new 61-Point High Density Reticular AF, the most sophisticated DSLR AF system Canon has ever released. The 21 focusing points in the central area are standard precision cross-type and effective with maximum apertures as small as f/5.6, depending on the lens in use. The center five points are also high-precision diagonal cross-type points for maximum apertures as small as f/2.8. All 61 points are sensitive to horizontal contrast with maximum apertures as small as f/5.6 and 20 of the outer focusing points function as cross-type points with maximum apertures as small as f/4.0. Other innovations of the new 61-point High Density Reticular AF include expanded AF coverage area, superior focusing precision and low light sensitivity, and greater low-contrast subject detection capability compared to earlier EOS AF systems. (See image below for AF point configuration)
това е от сайт на който канонджии вярват безусловно
за новите никони обаче числото 8 се споменава...
The D4 has a new autofocus sensor and, while its headline improvement is that it can now focus in lower light, this isn’t the only step forward. The sensor module has also been redesigned to enable it to operate with slower lenses (and lens/teleconverter combinations that give slower effective apertures). As before, with lenses of f5.6 or faster, 15 of its 51 AF points act as cross-type: sensitive to both horizontal and vertical detail. The 9 central focus points will continue as cross type when used with lenses with a maximum aperture of between f5.6 and f8. And, in a step forward for the range, the D4’s central AF point will still operate as a cross-type point with lens or lens/converter combinations with a maximum aperture of f8. In addition 10 AF points retain horizontal sensitivity at this aperture.
а и лично съм го пробвал
снимката с жената на спирката макар ималка си има екзиф
по отношение на фокуса... за сега никон са с гърди напред ![[shtrak]](https://photo-forum.net/forum/smileys/shtrak.gif)
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