Objective Lens， Refracting Telescope Objective Lens Dia104 Focal Length 600 1200 DIY Astronomical DKD Achromatic Multi-Layer Film,for Doublet Convex Lens(600mm)

========High-concerned chemical : NoneModel Number : D104

• Made optical glass with precision polishing, ensuring stable performance and long service life.
• This refracting telescope objective lens has a 104mm diameter, with 600mm and 1200mm focal lengths, featuring DKD achromatic design and multi-layer coating for DIY astronomy use.
• The achromatic optical structure effectively reduces chromatic aberration, providing sharp and clear imaging and celestial observation.
• Multi-layer film coating improves light transmittance, reduces reflection and stray light, ensuring brighter and more stable viewing performance.
• Made polished optical glass, it features low distortion, high durability and reliable performance for long-term DIY telescope use.
• Two focal length options meet different observation needs, suitable for homemade telescope assembly, replacement and upgrade projects.