Diaphragm Blades???

Discussion in 'Photography Beginners' Forum' started by rprimeau95, Sep 11, 2007.

  1. rprimeau95

    rprimeau95 TPF Noob!

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    What does the term Diaphragm Blades mean when it comes to lenses?

    I see some say 8 blades, 7 blades, 5 blades etc... what does the number mean what does the higher number vrs lower number of blades mean?
     
  2. Big Mike

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

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    Take a look at the logo on the add for Adorama, in the top right of the page.

    The 'O' is a crude representation of a lens diaphragm.

    The diaphragm is made up of 'blades' that move in a way to contract the aperture of the lens. The more blades, the more circular the opening between them. Many people believe that a more circular opening makes for better image quality. Specifically, things like better bokeh, which is the out of focus areas.

    It's not something I would really worry about.
     

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