Has rounded aperture blades. Canon RF 70-200mm f/2.8L IS USM. Sony FE 70-200mm F2.8 GM OSS. Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor. Rounded blades, often only found on more expensive lenses, improve the appearance of the out-of-focus areas.
The EF 24-70mm f/2.8L II USM is the latest lens from the elite L-series to offer Canon's high-grade and user-focused design enhancements. The mechanical structure of the lens has been improved to offer enhanced zoom durability and greater shake and shock resistance within the lens barrel.
One interesting design is the original Canon EF 24-70mm f/2.8 L introduced in 2002 and replaced by the EF 24-70mm f/2.8 L II in 2012. The older design is fully extended at 24mm and fully retracted at 70mm. To the uninformed observer it appears that the lens is "zoomed in" when it is actually "zoomed out" and vice-versa.
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