Objective Lens， 72 73mm Telescope Cemented Doublet Objective Lens Achromatic Optical Lenses Focal Length 280mm 700mm,for Doublet Convex Lens(72F700G)

=========High-concerned chemical : NoneModel Number : 72 73mm Cemented Doublet Lens

• Made optical glass with precision polishing, ensuring stable performance and long service life.
• This 72/73mm cemented doublet objective lens features achromatic optical design, with 280mm and 700mm focal lengths for astronomical telescopes.
• The achromatic doublet structure effectively reduces chromatic aberration, providing sharp,images for celestial observation.
• Made polished optical glass, it ensures high light transmittance, low distortion and stable long-term performance.
• Two focal lengths are available to meet different observation and DIY assembly requirements for refracting telescopes.
• Standard caliber and reliable cemented design ensure easy installation, ideal for telescope building, replacement and upgrading.