18-55mm but not wide angle?

Discussion in 'Photography Beginners' Forum' started by divided, Dec 2, 2007.

  1. divided

    divided TPF Noob!

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    I see 18-55mm lens as the basic "kit" lens, but i dont understand the 18mm part, isn't 18mm considered a fish eye? What am i missing here?
     
  2. jstuedle

    jstuedle No longer a newbie, moving up!

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    A fisheye lens has a unique distortion that is typical to that type of lens. Many fisheye lenses have a circular image with the corners of the frame blacked out. A wide angle lens is manufactured to reduce or eliminate this distortion to the best of the makers ability. OTOH, kit lenses are made to be inexpensive, so a lot of corners are cut to make it as cheaply as possible. At extreme ends of there zoom range, often distortion is seen,. But nowhere near what could be called fisheye distortion at the wide end.
     
  3. JIP

    JIP No longer a newbie, moving up!

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    Yes the "fish eye" effect starts at 16 or even 14.
     
  4. divided

    divided TPF Noob!

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    maybe i worded that wrong, so 18mm is considered "wide angle" why is a 18-55mm lens so cheap, yet a fixed lets say 22mm lens so expensive?
     
  5. Coldow91

    Coldow91 TPF Noob!

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    the build quality and the max aperture of the lens would factor into the price. but you can still get very sharp clear images with a kit lens.
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    The 18-5mm lens (and others like it) are designed for digital SLR camera that have a sensor which is smaller than a frame of 35mm film.

    When you think of 18mm as 'really wide' that is true...on 35mm film cameras, which have been the standard for many years. Today, most DLSR cameras have sensors that are slightly smaller, which results in a crop of the field of view...which gives us the 'crop factor'. On most Canon DSLR cameras, the crop factor is 1.6. So when you use a 50mm lens, the FOV is 'cropped'...and you get the same FOV as an 80mm lens would have on a film camera. So 18mm on these cameras, really only has the FOV that you would expect from 28mm on a film camera...which isn't really very wide.

    If you want a really wide angle, you need something like the Canon 10-22mm lens.

    You can still use 'fish eye' lenses...but the edges of the image through the lens would be 'cropped'...so you loose a lot of the effect. I beleive that Sigma has a 10mm fish-eye, which would work on these 'crop cameras'.
     
  7. divided

    divided TPF Noob!

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    Thanks for the explanation, that explains what i was looking for!
     
  8. GwagDesigns

    GwagDesigns TPF Noob!

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  9. _SnapShot_

    _SnapShot_ TPF Noob!

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    Prime lenses like a 22mm are sharper and you pay for that perfection.

    Zoom lenses have more variations, but give up a little because they have to be varied focal lengths.

    The 22mm is going to be a faster lens also.

    The 22mm probably has better construction and more elements.
     

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