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Changing ISO question

SorinSorin Registered Users Posts: 29 Big grins
edited June 16, 2011 in Technique
I didn't want to clog up another thread with this question, so I brought it here. I was looking at some outdoor wildlife shots here. The photographer nicely added in all technique info which is quite helpful. The one thing that stuck out to me was that the ISO was so high for outdoor daylight shots (I recall one at ISO 1250), and the f/stop was varying from f/16-22. Why? It seems so backwards. If your f/stop can be dropped and your ISO dropped, why wouldn't you take advantage of that? What am I missing?
"I know you don't understand. Let me show you......"
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My 50 f/1.8 lives on my Nikon D80 full time.
Next Lens: Tamron 28-75 f/2.8

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    basfltbasflt Registered Users Posts: 1,882 Major grins
    edited June 16, 2011
    high shutterspeed , perhaps ?
    Bas

    /ɯoɔ˙ƃnɯƃnɯs˙ʇlɟsɐq//:dʇʇɥ
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    RichardRichard Administrators, Vanilla Admin Posts: 19,929 moderator
    edited June 16, 2011
    The only thing that occurs to me is that the shooter was trying to maximize depth of field. Were there several points of interest at different distances?
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    ziggy53ziggy53 Super Moderators Posts: 23,836 moderator
    edited June 16, 2011
    Sorin wrote: »
    .... The one thing that stuck out to me was that the ISO was so high for outdoor daylight shots (I recall one at ISO 1250), and the f/stop was varying from f/16-22. Why? It seems so backwards. If your f/stop can be dropped and your ISO dropped, why wouldn't you take advantage of that? What am I missing?

    You need to take into consideration all the elements the photographer was trying to achieve.

    In the case of:

    http://dgrin.com/showpost.php?p=1629255&postcount=1

    ... I believe that Maxis needed the higher ISO to allow the particular DOF as well as an acceptable shutter speed to stop the birds' actions. Remember, this is an 800mm lens that has pretty shallow DOF, as evidenced by the background bokeh.

    In the case of:

    http://dgrin.com/showpost.php?p=1628706&postcount=1

    ... Harry is using ISOs 500 through 1250 to provide similar qualities for his long focal lengths and long effective focal lengths; a particular DOF and acceptable shutter speed for the subject.

    Time-of-day has additional bearing as well as time-of-year (to a somewhat lesser degree). Shooting early and late in the day allows some spectacular sunlight, but at diminished levels.
    ziggy53
    Moderator of the Cameras and Accessories forums
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    SorinSorin Registered Users Posts: 29 Big grins
    edited June 16, 2011
    Aahh, the long focal length. I am not used to how large lenses work re: DOF. Thanks for explaining.
    "I know you don't understand. Let me show you......"
    My Website
    My 50 f/1.8 lives on my Nikon D80 full time.
    Next Lens: Tamron 28-75 f/2.8
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