Unitron spotting scopes offered an air-spaced coated achromatic objective lens in various diameters, ranging from 50mm to 100mm. Images are erect, and non-reversed, in the same natural orientation as the unaided eye. A variety of interchangeable and optional accessories were available for the various models.
Unitron 70 mm Spotting scope; photos courtesy of Stephen Payne:
Unitron 80 mm Spotting scope with erecting prism:
Unitron 80 mm Spotting scope with 4 eyepiece turret: