Baader Filters 2 ' Semi APO filter (flat-optically polished) - 04/07 (10902)

The Baader Semi-APO filter is a highly advanced optical accessory designed for achromatic refractors, combining the features of Neodymium Skyglow and Fringe Killer filters. It enhances contrast, eliminates false colors (such as blue and NIR ends of the spectrum), and improves image sharpness without altering the overall color balance. This makes it particularly effective for budget refractors with limited chromatic correction.

Key Features:

• Contrast Enhancement and Color Correction: The filter cuts blue and near-infrared wavelengths, reducing chromatic aberration while maintaining natural color tones.

• High-Quality Coatings: Equipped with plasma-enhanced dielectric coatings (nearly 50 layers per side) and Baader's Phantom Group anti-reflection coatings for optimal performance.

• Fine-Optically Polished Surface: Ensures no loss of sharpness even at high magnifications or when positioned far from the focal point.

Specifications:

• Transmission Range: Multiple bands (refer to spectral image).

• Filter Type: Bandpass.

• Usage: Contrast enhancement, color correction, IR-Cut.

• Anti-Reflection Coating: Phantom Group coating, plane-optically polished.

• Filter Thickness: 1 mm (without cell), 6 mm (with cell).

• Size: 2"

• SKU Codes: BA2458399 (2").