In our previously developed bio-inspired eyeball cameras,Ìýphotodetectors are distributed on curvilinear surfacesÌýto match the strongly nonplanar image surfaces (i.e., Petzval surfaces) that form with simple lenses. Although these systems provide advantages compared to those with conventional, planar designs, their fixed detector curvature renders them incompatible with changes in the Petzval surface that accompany variable zoom achieved with simple lenses.Here, we put stretchable photodetector arrays on thin elastomeric membranes, capable of reversible deformation into hemispherical shapes with radii of curvature that can be adjusted dynamically, via hydraulics. Combining this type of detector with a similarly tunable, fluidic planoconvex lens yields a hemispherical camera with variable zoom and excellent imaging characteristics.
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