F-Stop and the Nikon D70s Kit Lense

Discussion in 'Nikon' started by Monty Bonner, Oct 12, 2005.

  1. Monty Bonner

    Monty Bonner Guest


    First I am confused. I have not had a DSLR or even used an SLR camera for a
    number of years, so I have to relearn everything over again, and suffer from
    a full brain.

    I purchased "Introduction to Nikon D70/D70s Digital SLR" DVD to help give me
    an education, but either missed something or he did not explain it.

    I have the kit lens 18-70 F3.5-4.5.

    I am trying to learn the Aperture Priority Mode in taking pictures, because
    it seems to give me more options as the camera will always find a shutter
    speed and take the picture.

    But when using the sub command dial to change the aperture, I can change it
    all the way from 3.5 to 22, even though the lens is only capable of 3.5-4.5.
    What gives here?

    I may not be describing it correctly, or have misunderstood the Video, which
    I will watch again once I am finished here looked at updated posts.

    Thank you in advance.

    Monty Bonner, Oct 12, 2005
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  2. Monty Bonner

    Nikon User Guest

    No, the lens has a maximum f/stop of f/3.5 at 18 mm, and a maximum
    f/stop of f/4.5 at 70 mm. The minimum f/stop is f/22

    So, at 18 mm, the lens is capable of f/3.5 to f/22, and at 70 mm, the
    lens is capable of f/4.5 to f/22.
    Nikon User, Oct 12, 2005
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  3. Monty Bonner

    DoN. Nichols Guest

    [ ... ]
    That 3.5-4.5 in the lens' name is not the total range of the
    aperture, but what is available at maximum aperture depending on the
    zoom setting. More expensive zoom lenses will keep the same maximum
    aperture throughout the zoom range (e.g. f2.8), so will have only f2.8
    In their designation. this does not meant that they can't go smaller.

    The lens *will* go down to f22 at need.

    I suspect that part of your confusion is from the fact that the
    "kit" lens does not have an aperture ring, which would make the range
    obvious. All aperture settings are under control of the camera body.

    As an experiment, select shutter priority, and point the camera
    at a medium-lit scene. While holding the shutter release at the
    half-pressed point (so the metering is turned on), rotate the necessary
    dial (in my D70 it is the front wheel with the current menu options, but
    it may differ on yours, depending on the selected menu options) to
    change the shutter speed, and observe the changes in aperture indicated
    on the camera. At widest zoom, (18mm), it will go from f3.5 down to
    f25, while at 70mm (semi-telephoto mode), it will go from f4.5 down to
    f29. I haven't bothered to check what the maximum aperture is at the
    intermediate ranges.

    Don't worry -- the camera knows what the lens is capable of.

    DoN. Nichols, Oct 13, 2005
  4. Monty Bonner

    no_name Guest

    MAXIMUM aperature (biggest diaphram opening) changes from f/3.5 at 18mm
    to f/4.5 at 70mm.

    You still have minimum aperatures (smallest diaphram opening) apparently
    to f/22. It may even go smaller than that zoomed to 70mm.
    no_name, Oct 14, 2005
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