Key Specifications:

Aperture: 152mm (6 inches)

Focal Ratio: f/5 (Focal Length: 760mm)

Optical Design: 2-element apochromatic (APO) doublet

Purpose: Designed for constructing high-performance DIY refractor telescopes.

Optical Performance:

Apochromatic Correction: Utilizes specialized glass (e.g., ED/Extra-low Dispersion) to virtually eliminate chromatic aberration, delivering sharp, color-accurate images across the visible spectrum.

Strehl Ratio: >0.95 (diffraction-limited performance) at 550nm wavelength.

Wavefront Error: ≤1/4λ (λ=632.8nm), ensuring exceptional contrast and resolution.

Mechanical Design:

Lens Cell: Precision-machined aluminum cell with thermal compensation for stable collimation across temperature changes.

Coating: Broadband multi-layer anti-reflective coatings 

Ideal Applications:

Astrophotography: Captures detailed deep-sky objects (nebulae, galaxies) thanks to the fast f/5 ratio and minimal false color.

High-Resolution Visual Observing: Resolves planetary details, double stars, and lunar features.

DIY Projects: Optimized for builders creating compact, wide-field refractors without compromising optical quality.

Unique Advantages:

Large Aperture + Fast Optics: Combines light-gathering power (152mm) with a short 760mm focal length for expansive views and reduced exposure times.

True APO Performance: Outperforms achromatic doublets in color correction, rivaling triplets at a lower cost/complexity.

Airy Disk-Optimized: Named for achieving a near-perfect diffraction pattern (Airy disk) critical for fine-detail imaging.