Diaphragm Blades???

[rprimeau95]

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?

 

[Big Mike]

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.