Originally posted by Nicolas06 (...)
Then we like to think we compare 51 AF point of D810 with 33 of K1 or 27 of K3 and think D810 has much more. The D810 has far less cross type AF point than even a K3.
So:
A D810 has 15 cross type sensor and 36 lines sensors, for a total of 66 lines sensor to cover the area. (each cross is 2 lines sensors).
A K3 has 25 cross type and 2 line sensor, that a total of 52 line sensors to cover the area.
A K1 would from this rumor have 33 croiss type sensors, that 66 line sensors to cover the area. Same number of sensors as D810. Exactly the same !
Ironically, the rumored AF specs of K1 and D810 mean they have the same hardware in term of line sensors but they are grouped differently. Assuming that the group of the K1 is necessarily inferior is kind of stupid. I'am sure both Nikon and Pentax choosed their design for good reason and would expect it to be a best compromize.
(...)
Indeed but the D810 autofocus is an ancient piece of hardware: it dates back to August 2007 (joint announcement of D3 and D300), eight and a half years ago, an eternity in digital ages.
The recently announced D5 and D500, and the soon (Photokina?) to be announced D820, rely on 153 AF points, including 99 cross-type sensors, hence a total of 252 line sensors if I'm following you correctly.