First Time FF User - 5DM3 or D600?

Started Oct 1, 2012 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 58,086
Re: Please elaborate on the "vastly" better AF

Press Correspondent wrote:

bobn2 wrote:

Press Correspondent wrote:

5D3 and 1Dx utilize a new AF system with high precision sensors in the latest lenses (2010+).

However, the high precision sensors are in the middle of the frame, requiring focus and recompose (losing that extra accuracy) if the subject isn't in the middle.

No, I was referring to magnetic rotation sensors built into the latest Canon lenses.

OK, but doesn't help the system when you are not using those lenses - and also of course we don't know the relative effectiveness of the rotation sensors that Nikon uses in its lenses.

The truth is this: both AF systems are complex. Both are what their designers thought was a good compromise between functionality and the physical limitations of AF. Nikon chose to concentrate on sensitive linear points towards the edges, where cross points don't work very well, and the extra space they use can be utilised to making better linear points, Canon decided on more cross points, presumably in the hope that the residual two axis sensitivity still outweighs the disadvantage. You can really only work out which is better by trying - cherry picking features when you don't understand the underlying technology doesn't give a good clue to which AF is better.

If the consumer level AF of D600 is so improved, then Nikon no longer needs the professional AF of D800 that has frightened so many people.

Who knows. Possibly Nikon has improved the 39 point system to the level where it is better than the 51 point system, possibly not. Probably they would not have both if they felt they both offered the same performance. Both concentrate the cross points in the centre of the fame.

Perhaps we will see the D600 AF in the upcoming D4X as well. Don't you sometimes feel lost in the labyrinths of your own logical puzzles?

My logic is not a puzzle and not labyrinthine. Your comprehension might be.

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Bob

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