Objective Lens， 70mm Series Cemented Doublet Objective Lens Multi Film Optical Achromatic for DIY Astronomical Refracting Telescope,for Doublet Convex Lens(D72F900mm Green Film)

=========High-concerned chemical : None

• Made optical glass with precision polishing, ensuring stable performance and long service life.
• This 90mm diameter achromatic lens is made optical glass with 900mm focal length, designed as objective lens for DIY astronomical telescopes.
• Adopting doublet double convex structure, it effectively corrects chromatic aberration and provides sharp, high-contrast images.
• Fine polished surface ensures high light transmittance, low distortion and stable optical performance for long-term observation use.
• The large aperture design improves light-gathering ability, delivering clearer and brighter views of celestial bodies.
• Standard size and simple structure make it easy to install, ideal for telescope assembly, modification and upgrading for astronomy lovers.