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Rounded aperture blades require a more complex opening/closing mechanism. Also more are required, in order to create a rounded aperture, hence they are found only on more expensive lenses. It is a cost-based manufacturing decision.

A rounded aperture produces a softer, more natural bokeh (out of focus areas).

See Wikipedia's article on diaphragms in optics for more details.

Rounded aperture blades require a more complex opening/closing mechanism than straight cut blades. Also more are required in order to create a rounded aperture, hence they are found only on more expensive lenses. It is a cost-based manufacturing decision.

A rounded aperture produces a softer, more natural bokeh (out of focus areas).

See Wikipedia's article on diaphragms in optics for more details.

Rounded aperture blades require a more complex opening/closing mechanism. Also more are required, in order to create a rounded aperture, hence they are found only on more expensive lenses. It is a cost-based manufacturing decision.

A rounded aperture created a produces softer, more natural bokeh (out of focus areas).

See Wikipedia's article on diaphragms in optics for more details.

Rounded aperture blades require a more complex opening/closing mechanism. Also more are required, in order to create a rounded aperture, hence they are found only on more expensive lenses. It is a cost-based manufacturing decision.

A rounded aperture produces a softer, more natural bokeh (out of focus areas).

See Wikipedia's article on diaphragms in optics for more details.

rounded aperture blades require a more complex opening/closing mechanism, also more are required, in order to create a rounded aperture, hence they are found only on more expensive lenses. it is a cost based manufacturing decision.

A rounded aperture created a produces a softer, more natural Bokeh (out of focus areas)

see Wiki: optics for more details

Rounded aperture blades require a more complex opening/closing mechanism. Also more are required, in order to create a rounded aperture, hence they are found only on more expensive lenses. It is a cost-based manufacturing decision.

A rounded aperture created a produces softer, more natural bokeh (out of focus areas).

See Wikipedia's article on diaphragms in optics for more details.