50mm Diameter Double Concave Spherical Lenses - Rapid PH30078/1, Double-concave spherical lens with a focal length of 50mm. Rapid Double Concave Spherical Lens- Diameter 50mm - Fl 50mm
50mm Diameter Double Concave Spherical Lenses - Rapid PH30078/9, A double-concave spherical lens with a focal length of 1000mm and a power of +1D. Rapid Double Concave Spherical Lens - Diameter 50mm - Fl 1000mm
50mm Diameter Double Concave Spherical Lenses - Rapid PH30078/2, A double-concave spherical lens with a focal length of 100mm and a power of +10D. Rapid Double Concave Spherical Lens- Diameter 50mm - Fl 100mm