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  1. #1
    Junior Member

    Changing ISO

    My daughter just got the Nikon d3400 ( my son and I have canon, so we can't really help) we are shooting astrophotography and want to set her camera on manual mode to 30. F 4.5 and when we try to change the ISO to 1600 or 800 the other numbers change or the ISO keeps flashing and won't go past 100. I assume there's something automatic we are missing but I'm not sure what it is. Can anyone help?

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  2. #2
    Senior Member
    Bikerbrent's Avatar

    Re: Changing ISO

    Welcome aboard. Enjoy the ride.
    We look forward to seeing more posts and samples of your work.

    I'll bet you have auto ISO turned on. If you want to manually set ISO, you have to turn Auto ISO off. Since I don't have this camera, I can't give you the procedure, but it is in the camera manual.
    Brent: Poway, CA
    D7200, D200, D70, F100
    Tokina 12-24mm
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  3. #3
    Senior Member
    Needa's Avatar

    Re: Changing ISO

    Welcome to Nikonites.

    I the camera didn't come with a manual you can download it here.


  4. #4
    Senior Member

    Re: Changing ISO

    I think the d3400 comes with a paper user manual, but what you want is the reference manual. Look for the Reference Manual at that link Needa posted.

    You definitely want to turn auto iso off in the menu like Brent said and be sure you are in M mode.
    I don't think the iso menu actually says 'off', I think you just don't pick auto and select the desired iso instead.

    You say the 'other numbers' were changing when you tried to change iso. If you are in M, shutter and aperture should not change unless you change them. If you were for sure in M, maybe the command wheel got accidentally turned at some point.
    I must have a really good camera.

  5. #5
    Challenge Team
    RocketCowboy's Avatar

    Re: Changing ISO

    Howdy and welcome to Nikonites! Brent had the right idea ... check that Auto ISO is not enabled, and disable that if it is. Seems like it's enabled by default, and would explain the behavior you're seeing.

  6. #6
    Senior Member
    Moab Man's Avatar

    Re: Changing ISO

    Agreed, auto ISO is on.
    D5100, D7100, D600, D750, Df
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    Wide Angle: Tokina AT-X116 Pro DX-II 11-16mm f/2.8, Rokinon f/2.8 14mm (chipped)
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  7. #7
    Senior Member
    JH Foto's Avatar

    Re: Changing ISO

    Hello and welcome........................................... ............
    I have an advanced degree in procrastination and another one in paranoia.

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