Lomography has launched its new Petzval 58 Bokeh Control Art Lens, the second lens it has introduced based on the Petzval optic invented by Joseph Petzval in 1840. As with other lenses offered by Lomography, this newest Petzval lens features Russian glass optics, is constructed by hand, and is offered in a brass finish (though a black finish is also available). The lens results in photographs with a 'swirly bokeh,' and the strength of the effect can be controlled via a Bokeh Control Ring, a feature not available in Lomography's existing 85mm Petzval, released in 2013.

According to Lomography, photographers 'can now get the characteristic swirly bokeh effect in ways it has NEVER been possible before.' This is thanks to the Bokeh Control Ring. It works in a way similar to Nikon's Defocus Control system, but rather than adding a system to induce positive or negative spherical aberration, the Lomography system adds an element to allow the correction of the inherent spherical aberration of the Petzval design. 

The Petzval 58 Bokeh Control Art Lens is a 58mm offering with a maximum f/1.9 aperture alongside support for Nikon F and Canon EF mounts. Like the Petzval 85 it uses the Waterhouse aperture system with interchangeable aperture plates ranging from f/16 to f/1.9.

Lomography has turned to Kickstarter for funding, where it's looking for $100,000 USD and has so far raised more than $260,000. A pledge of at least $450 USD is required to reserve a single copy of the lens. The batch from the initial production run is sold out, but those who back now will get a unit from the second batch estimated to begin shipping in March 2016.