Objective Lens， Cemented Glued Lenses Achromatic Lens for Refracting Astronomical Telescope Objective 70mm Series F280 F400 F700,for Doublet Convex Lens(D73F400 Green Film)

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

• Made optical glass with precision polishing, ensuring stable performance and long service life.
• This 70mm series achromatic cemented lens comes in F280, F400 and F700 focal lengths, designed as objective lens astronomical telescopes.
• The cemented achromatic structure effectively corrects chromatic aberration, delivering sharp, high-contrast images for clear and celestial observation.
• Made optical glass with fine polishing, it ensures high light transmittance, low distortion and stable optical performance.
• Multiple focal length options meet different observation needs, perfect telescope assembly, modification and upgrading.
• Standard 70mm caliber provides good compatibility, easy to install and ideal for astronomy enthusiasts to build homemade refracting telescopes.