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Dual apertures

Second aperture

Second aperture

Round aperture, front view

Round aperture

Many mounts

Velvety

Tension

Top

Right side

Lens cap

Front

Left side

Lensbaby adds a twist to its latest special-effects lens, the Burnside 35. In addition to the native swirly bokeh like that of the Twist 60, there's a second aperture with which you dial in the degree of vignetting and saturation.

Caption by / Photo by Sarah Tew/CNET

The second aperture closes above the first, which adds vignetting and allows in less light, making the image look darker and more saturated. 

Caption by / Photo by Sarah Tew/CNET

Because it has six blades instead of eight, the out-of-focus highlights also have a slightly different quality.

Caption by / Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET

The lens has a traditional round eight-blade aperture; the effect slider has a polygonal six-blade aperture that overlays the first to cover the edges of the frame.

Caption by / Photo by Sarah Tew/CNET

The lens comes in Canon EF, Nikon F, Sony A, Pentax K, Micro Four Thirds, Sony E, Fuji X and Samsung NX mounts.

Caption by / Photo by Sarah Tew/CNET

The design of the Burnside is most like Lensbaby's Velvet line, all-metal with no drop-in lenses like the company's lower-end lenses.

Caption by / Photo by Sarah Tew/CNET

Like the Velvet lenses, the focus ring has good tension, and you do have to rotate it a lot to get from one end of the focus range to the other.

Caption by / Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET

/ Photo by Sarah Tew/CNET
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