Insta360 One RS 4K Edition (I04CINRSGP/E )

Huge focal length, compact and lightweight design. The NIKKOR Z 800mm f/6.3 VR S, from Nikon, is a super-telephoto prime distinguished by the unique combination of one of the longest focal lengths available in a surprisingly portable package. This distinct design is made possible by the inclusion of a Phase Fresnel element, which cuts the overall weight by 50% and the length by 16% compared to the former F-mount 800mm f/5.6 lens.

Compact, Lightweight Design

A sophisticated mixture of technologies makes this super-telephoto a relatively sleek lens, opening up new possibilities for a focal length that was previously relegated to tripod/monopod usage.
Phase Fresnel element not only compensates for chromatic aberrations and color fringing but it also replaces several conventional glass elements to promote a more compact and lightweight optical layout.
Modest f/6.3 maximum aperture strikes a balance between a practically bright design and a lightweight construction.
Compared to the former F-mount 800mm f/5.6 lens, which weighs over 10 lb, this new Z-mount 800mm f/6.3 lens is half the weight at 5.25 lb. Additionally, the mirrorless-specific design also contributes to a shorter overall lens length, measuring just over 15" long, compared to the former lens that measures 18"-long.