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Autofocus problem

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    alex_noel
    alex_noel  2 United Kingdom
    19 Aug 2012 - 7:34 PM

    I have a 300D. I recently used autofocus to focus in the distance. I then zoomed in to see it was out of focus. Repeated. Same. Is this normal. Should I use manual instead?

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    bmh1
    bmh1 e2 Member 8571 forum postsbmh1 vcard United Kingdom1 Constructive Critique Points
    19 Aug 2012 - 7:53 PM

    Most lenses will need to re-focus when you change the zoom - there is a specific term (which I can't remember) to describe the few lenses which do keep their focus when the zoom changes though it roughly translates as 'expensive' Smile ...

    newfocus
    newfocus  8644 forum posts United Kingdom2 Constructive Critique Points
    19 Aug 2012 - 8:03 PM

    Parfocal's the term for maintaining focus when zooming and I think for Canon, only a few of the L lenses are in that category.

    sherlob
    sherlob e2 Member 82314 forum postssherlob vcard United Kingdom125 Constructive Critique Points
    20 Aug 2012 - 10:43 AM


    Quote: there is a specific term (which I can't remember) to describe the few lenses which do keep their focus when the zoom changes though it roughly translates as 'expensive' ...

    Love it!

    cheddar-caveman
    22 Aug 2012 - 11:18 AM

    Using a zoom you have to zoom first then half press the shutter to activate the auto focus. Focus does change while zooming (except with the Parfocal lenses).

    mikehit
    mikehit  56329 forum posts United Kingdom9 Constructive Critique Points
    22 Aug 2012 - 11:31 AM

    I think the OP means they 'zoomed in' on the LCD and saw that it was out of focus.

    Accuracy of the autofocus depends on quite a few factors - and the AF area is often bigger than the AF point in the viewfinder so if it finds something of higher contrast than the stubject you want to take a picture of then it will focus on that instead.

    User_Removed
    22 Aug 2012 - 1:53 PM


    Quote: I think the OP means they 'zoomed in' on the LCD and saw that it was out of focus

    Nah, could be wrong but I think he means the first way lol

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