Units vary in light output and utilize a variety of power sources: AC, DC, rechargeable Lithium ion and AA batteries.
Distributor Edma Photomarketing says their flexible power requirements and portability make them a popular choice for location photography and videography.
VidPro also offers an extensive assortment of lithium ion digital camera and camcorder batteries.
Zoom creep is the tendency for a lens to extend or collapse under its own weight when pointed upward or downward.
One size fits all lenses, and the bands are available in a variety of colours and patterns.
Apparently many photographers have used it on hard-to-remove lens filters or simply to add a little personality to their lenses.