Abstract: An assembly allowing a user to adjust a relative positioning of an imaging portal of a lens attached to an electronic device relative to the viewing portal of a lens of an optical device. The assembly is made up of a planar adjustment unit having multiple plates that frictionally interface with one another such that they allow movement by a user. The components of the planar adjustment unit are held together by at least one elastically deformable element that passes through the channels in the sliding plates of the planar adjustment unit. The at least one elastically deformable element holds the planar adjustment unit together in tension such that the assembled plates may still slide with respect to one another, but remain in place by static friction when not moved by a user. The planar adjustment unit may be further combined with components allowing for three-dimensional adjustment of an imaging portal of a lens attached to an electronic device relative to a viewing portal of a lens of an optical device.