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Thread: Autofocus - cross-type and line-type

  1. #1

    Question Autofocus - cross-type and line-type

    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?

  2. #2
    Senior Member
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    Default Re: Autofocus - cross-type and line-type

    Quote Originally Posted by PowerShort View Post
    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?

  3. #3

    Default Re: Autofocus - cross-type and line-type

    Do you shoot with tracking AF?

  4. #4

    Default Re: Autofocus - cross-type and line-type

    calebk: Yes, quite often...

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

  5. #5
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    Default Re: Autofocus - cross-type and line-type

    Quote Originally Posted by PowerShort View Post
    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?

  6. #6

    Default Re: Autofocus - cross-type and line-type

    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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