PetKal wrote:
* Same lens/TC combo , same geometry of light impingement:
-1DMkIV allows center point AF at f/8.
-1DX with more sensitive AF points doesn\'t allow AF at f/8.
Using any additional AF points is less relevant to this. I could have also suggested that they might have lowered the single point AF to f/11 in 1DX.
That sure sounds like an oddity to me.
* Canon probably knows very well that TC use which pushes nominal aperture to f/8 is relatively common, not sporadic at all.
It\'s not at all an oddity. When they\'re talking about aperture sensitivity they\'re talking about geometry sensitivity, not light sensitivity. So the design choices they made in making the sensor still cross type at f4 meant they\'re no longer at some threshold to be certified as of sufficient sensitivity at f/8. That said, they also claim to have improved the light sensitivity.
The second part is much more the issue, and my gut instinct says that it\'s certainly non zero though it won\'t be that common as a factor in a body purchase, given that the only situation this becomes a hard limit is when the combo in question is an 800/5.6 +TC or 600/4 + 2x TC (in the set of all 1D users likely to seriously consider this as a new body purchase). If you are one of those, it is a major issue - I just don\'t think there are enough people for whom it is an issue AND for whom this would tip a purchase decision from a yes to a no balanced against the other advantages the 1DX brings.
Of course, I could be horribly wrong.
Oct 18, 2011 at 05:33 PM
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