Sigma 4.5mm f2.8 EX DC Circular Fisheye

Sigma 4.5mm f2.8 EX DC Circular Fisheye priručnik

  • Thank you very much for purchasing a Sigma Lens. In order to get the
    maximum performance and enjoyment out of your Sigma lens, please
    read this instruction booklet thoroughly before you start to use the
    Adapter Ring
    Focus Ring
    Distance Scale
    Focus Index Line
    Focus Mode Switch
    Filter Holder
    Guide Plate
    The 4.5mm f/2.8 EX DC HSM Circular Fisheye lens has an angle of
    view of 180 degrees in all directions. When used in conjunction with
    digital SLRs with APS-C size image sensors, it produces a perfectly
    circular image within the frame.
    If used with a film or full frame digital SLR camera, the circular
    image produced will appear much smaller within the centre of the
    It is recommended that either spot or center-weighted metering is
    used. (Multi-Pattern, Multi-Zone and Honeycomb metering may not
    prove accurate.)
    It is recommended to check composition of your image through the
    viewfinder as the extraordinarily wide angle of view of this fisheye
    lens may capture extremities of the unsuspecting photographer.
    When this lens is attached to the camera body it will automatically
    function in the same way as your normal lens. Please refer to the
    instruction booklet for your camera body.
    On the lens mount surface, there are a number of couplers and
    electrical contacts. Please keep them clean to ensure proper
    connection. To avoid damaging the lens, be especially sure to
    place the lens with its front end down while changing the lens.
    When you take a picture, please remove the lens cap and the
    adapter ring (fig.1-) not just the lens cap, to avoid vignetting.
    The sigma lens functions automatically after mounting to your camera.
    Please, refer to the camera instruction book.
    This lens features Sigma’s built-in Hyper Sonic Motor (HSM). The
    HSM enables quick and quiet autofocusing.
    For autofocus operation, set the focus mode switch on the lens to the
    AF” position (fig.2). If you wish to focus manually, set the focus mode
    switch on the lens to the “M” position. You can adjust the focus by
    turning the focus ring.
    For autofocus operation, set the camera to AF mode and set the focus
    mode switch on the lens to the “AF” position (fig.2). If you wish to
    focus manually, set the focus mode switch on the lens to the “M
    position. You can adjust the focus by turning the focus ring.
    Please refer to camera’s instruction manual for details on changing
    the camera’s focusing mode.
    For Nikon, Pentax and Sony mounts, it is only possible to use AF
    with camera bodies which support motors driven by ultrasonic
    waves such as HSM. AF will not function if the camera body does
    not support this type of motor.
    This lens also permits manual focusing even in the autofocus mode.
    With the camera set to the One-Shot AF (AF-S) mode, it is possible
    to manually override the autofocus while the shutter release button
    is pressed halfway.
    When operating this lens in manual focus mode, it is recommended
    that correct focus be confirmed visually in the viewfinder rather than
    relying on the distance scale. This is due to possible focus shift
    resulting from extreme changes in temperature which cause
    various components in the lens to expand and contract. Special
    allowance is made for this at the infinity setting.
    This lens has a short focal length and gives a wide depth of field
    and wide focusing area in front of and behind the subject. For this
    reason, the focusing position with AF may not match the position of
    the Distance Scale on the camera body.
    If the subject is too small, it may not be possible for the camera’s
    AF sensor to focus on it. Please ensure the subject is in the AF
    frame before shooting.
    Because of the extremely wide angle of view of this lens, flare and
    ghosting may occur much more easily than with other lenses. When
    you take a picture with this lens, please pay special attention to flare
    and ghosting which can occur when shooting near or directly into the
    sun or other very bright lights.
    Filters cannot be mounted on the front of the lens. If you wish to use
    filters, please use gelatin type. Please cut the gelatin filter, using the
    guide plate accessory as a pattern, and insert the filter into the filter
    holder at the rear of the lens. (fig.3)
    Avoid any shocks or exposure to extreme high or low temperatures
    or to humidity.
    For extended storage, choose a cool and dry place, preferably with
    good ventilation. To avoid damage to the lens coating, keep away
    from mothballs or naphthalene gas.
    Do not use thinner, benzine or other organic cleaning agents to
    remove dirt or finger prints from the lens elements. Clean by using
    a soft, moistened lens cloth or lens tissue.
    This lens is not waterproof. When you use the lens in the rain or
    near water, keep it from getting wet. It is often impractical to repair
    the internal mechanism, lens elements and electric components
    damaged by water.
    Sudden temperature changes may cause condensation or fog to
    appear on the surface of the lens. When entering a warm room
    from the cold outdoors, it is advisable to keep the lens in the case
    until the temperature of the lens approaches room temperature.
    Lens construction 9 – 13
    Angle of View 180°
    Minimum Aperture 22
    Minimum Focusing Distance 13.5cm (0.44 ft)
    Magnification 1:6
    Dimensions Dia.×Length 76.2×77.7mm (3×3.06in)
    Weight 470g (16.6 oz)
    Dimensions and weight include the SIGMA mount.
Sigma 4.5mm f2.8 EX DC Circular Fisheye

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