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Kinda Noob Question..

Discussion in 'General Discussion' started by zerocool, Sep 7, 2008.

  1. zerocool


    Jan 21, 2008
    Tracy Calif
    i have a chance to buy a Tamron 500mm F8 Mirror Lens...

    but im confused as to what it means by Mirror Lens...

    someone give me a hand?
  2. Spectre


    Feb 20, 2008
    As the name implies these lenses are mainly based on mirrors rather than glass elements. Incoming light gets reflected by a main mirror (located at the back of the lens) towards a small secondary mirror (at the front) which then reflects the light back towards the film via a correction (glass) element.

    Due to the design there are several drawbacks to mirror lenses.

    No aperture so it's not possible to control the depth-of-field.
    The mirror reflections reduce contrast
    The overall sharpness is usually mediocre
  3. Lurker


    Jul 21, 2007
    Catadioptrics are light, short and give you a large focal length in a small package.

    As Paul pointed out there are some drawbacks. Most of those have more to do with the fact that most CD's on the market are cheap lenses. The hubble uses a mirror and the sharpness is (after nasa fixed it, that is true :rolleyes: ) stunning.

    The biggest problem that you'll find with a mirror lens is that any highlight in the background will be displayed as a donut shape. (Donuts. Is there anything they can't do? - Homer Simpson).

    Here is a wikipedia image that shows exactly what to expect:
    Subscribe to see EXIF info for this image (if available)
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