Contrast Booster 1.25″ – Contrast increase and reduction of the
chromatic aberration in refractors (Phantom Group coated).
The Contrast Booster is a further development of the simple minus
Violet Filters. It blocks the portion of light in the short-wave blue range
almost completely – the chromatic aberration of Fraunhofer refractors is reduced
almost completely eliminated. Hard on both sides, absolutely scratch-resistant
Coating, can be cleaned as often as you like. Suitable for everyone
achromatic refractors from 130mm aperture – if it is a
complete elimination of the color error. The picture will be there
colored yellowish, similar to “minus violet filters”, but with
significantly better results in terms of contrast and sharpness.
Substrate (glass melt): neodymium-doped colored glass, 2mm thick
Coating/Back: 7-layer multi-layer hard coating
Coating/Front: 23-layer ion beam longpass block coating