The Helios 28mm f2.8 is an wide angle lens that has a fairly fast aperture and is sharp enough to use wide open.
This lens is natively an M42 mount, but has been adapted to EF. The lens is known for having swirly bokeh and rippling flares. This lens was made in Japan, but originally, Helios lenses began in Russia.
This lens covers Full Frame, Super 35mm and m4/3 digital sensors.