Autofocus - cross-type and line-type


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Jun 30, 2009
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#1
I wonder how big a difference it makes to have multiple focus points cross-type? I've used the line-type points without much problems, however I'm not sure how it compares to cross-type points in terms of speed AND accuracy. Is it worth investing in a body with multiple cross-type points?
 

calebk

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Jul 25, 2006
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Clementi
#2
I wonder how big a difference it makes to have multiple focus points cross-type? I've used the line-type points without much problems, however I'm not sure how it compares to cross-type points in terms of speed AND accuracy. Is it worth investing in a body with multiple cross-type points?
Have you shot a lot in low light?
 

chalib

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Oct 4, 2007
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#3
Do you shoot with tracking AF?
 

Jun 30, 2009
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#4
calebk: Yes, quite often...

chalib: Yeah but so far I've not shot very fast moving objects.
 

calebk

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Jul 25, 2006
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#5
calebk: Yes, quite often...

chalib: Yeah but so far I've not shot very fast moving objects.
How low light is your low light?

Does your low light equate to ISO 3200, f/2.8, 1/30s or thereabouts?
 

Jun 30, 2009
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#6
calebk: More or less.

I tried to focus using the line-type points on a piece of foolscap paper. I found that it tried hard to focus (errors/searching). Turned the paper 90 degrees and problem solved. It could only detect horizontal details I guess. I tried using the cross-type and had no problem; fast and accurate. I wonder how it translate to real world performance, especially when shooting fast moving objects.
 

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