This invention discloses an optical zoom lens assembly, sequentially arranged from an object side to an image side along an optical axis comprising: a first lens-group, a second lens-group and a third lens-group. The invention includes a collapsible rigid frame designed to support an enclosure at a predetermined height. Examples of such classifications include action scenes, slow scenes, low or high detail scenes, and brightness of the scenes. A signal processing system compares the signals from the two sensors to produce an estimate of the signal-to-noise ratio. The metal nanoparticles of the invention are characterized by being modified with a cyclic phenylazomethine compound having a structure represented by Chemical Formula 1.