SIGMA EF-630 Multifunctional, Electronic Flash for Nikon: Greater Output of Light with a Guide Number 63, Rear Curtain Flash, Wide Angle Illumination, Compatible with Lenses of 24mm to 200mm Focal Length 2017-06-12
Sigma: sd Quattro Mirrorless Camera, 30mm F1.4 DC HSM Art Lens and EF-630 Flash: Pricing and Availability 2016-06-25
