11 common lens errors and how you can avoid them

    | Photography Tips | 05/06/2013 00:01am

    Common Lens Error No. 7: Exposure changes when zooming

    Control depth of field to isolate subjects

    Unless you have an expensive, high-quality zoom lens with a constant maximum aperture, you need to watch out for the exposure changing when zooming from one end of the lens to the other.

    The average kit lens, for example, has a maximum aperture of f/3.5 at the wideangle end and f/5.6 at the telephoto end.

    This means that if you are shooting with the aperture wide open at the shortest focal length and you zoom into the longest point the aperture will change.

    If you’re shooting in aperture priority or one of automatic modes the shutter speed will change automatically, so the brightness of the shot won’t change but you need to beware of the shutter speed falling below a safe hand-holdable speed.

    If you’re shooting in manual exposure mode the image will get darker when you zoom in to a longer focal length if you don’t adjust the shutter speed to compensate.

    Common Lens Error No. 1: Blurred image
    Common Lens Error No. 2: Too much depth of field
    Common Lens Error No. 3: Depth of field too shallow
    Common Lens Error No. 4: Distorted portraits
    Common Lens Error No. 5: Converging verticals
    Common Lens Error No. 6: Can’t focus close enough
    Common Lens Error No. 7: Exposure changes when zooming
    Common Lens Error No. 8: Flare
    Common Lens Error No. 9: Camera unbalanced with telephoto lens
    Common Lens Error No. 10: Vignetting
    Common Lens Error No. 11: Soft images


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    Posted on Wednesday, June 5th, 2013 at 12:01 am under Photography Tips.

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