Sigma's bokeh master is a hefty and pricey bit of glass, but it can shoot some of the dreamiest portraits you'll see ...

Want that Hollywood swirling bokeh effect? You’ll need one of Lomography’s Joseph Petzval Art Lens Series primes, ranging from 27mm to 135mm ...

It may be possible to extend the life of lithium-ion batteries using standard, low-cost chemistry. Lithium-ion batteries consist of a negative anode and a positive cathode with a porous separator ...