Retardation plate (λ/4 platelet) made of plastic foil, rotatable on a ball-bearing in a holder on a stem. With an angle scale possessing 1° increments.
Aperture: 38 mm Ø
Retardation: λ/4 at 560 nm
Height of the optical axis: 150 mm
Holder: 100 mm Ø
Stem: 10 mm Ø
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