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f/ stop query

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    HuntedDragon
    31 Mar 2009 - 12:56 PM

    i've notised a few things about the f/.. as i thought it, it's a case of the higher the number the more in veiw (feild of depth?) but.......

    f4 at distance gives plenty in focus, whilste close up on say 180mm f/22 sometimes gives a 2 inch in focus region..then other times close up f/8 or 9 does a similar thing?

    ok, at a couple thousand yards i was thinking f/4's 'depth' would probably cover more ground due to the distance of things in ratio to the lens its self, e.g. 5 rows of houses at 20 yards on onwards should be a hi f/.. but veiwing at a thusand odd yards its distance would apear (in the lens dimentions) as maybe one street.. or even just as a matter of a few yards so it'd 'be in focus'..

    the other was light, the darker it is the more crutial the f/ would be, as in the lighter it is the more you can see and the less crutial the aperture?

    can some one put this into terms and exsplain it.. is it me? a lens interface thing? etc etc?

    after edit... the smaler the aperture obviously the 'darker' it is so a longer shutter speed/higher ISO needed.... does that affect the depth of veiw?
    (and should the image be that shitty on a hi f/ number? seems on some shots its very crutial to just getting a desent image....)

    Last Modified By HuntedDragon at 31 Mar 2009 - 1:01 PM
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    Henchard
    Henchard  92744 forum posts United Kingdom1 Constructive Critique Points
    31 Mar 2009 - 1:01 PM

    A tedious explanation

    and a depth of field calculator

    newfocus
    newfocus  8644 forum posts United Kingdom2 Constructive Critique Points
    31 Mar 2009 - 1:03 PM

    Try this...

    HuntedDragon
    31 Mar 2009 - 1:13 PM

    hmmm nicely put thank you...

    66tricky
    66tricky  7742 forum posts Scotland
    1 Apr 2009 - 4:24 PM

    Tamron visual DoF comparison tool

    Last Modified By 66tricky at 1 Apr 2009 - 4:25 PM
    XxPaulxX
    XxPaulxX  8260 forum posts England
    5 Apr 2009 - 7:27 AM


    Quote: Hmmm nicely put thank you...

    I think you might have mis-interpreted Henchard, his link is to a tedious explanation, he wasn't referring to your post.

    Just check out the dof calculator and vary the settings, this will give you a good idea of depth of field at certain apertures and certain focal lengths and distances to subject.

    Paul

    Last Modified By XxPaulxX at 5 Apr 2009 - 7:30 AM
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