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[xlmodel]-[custom]-[8888131mm Large Optical Dual Separation Doublet Lens Focal Length 1200 700mm DIY Refractor Telescope Objective Achromatic Lentes

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131mm Large Optical Dual Separation Doublet Lens Focal Length 1200 700mm DIY Refractor Telescope Objective Achromatic Lentes

Product parameters

Dual Separation Achromatic Lens

Material: Optical Glass

Lens Diameter:131mm

Focal Length:700mm 1200mm Astronomical telescope objective lens with multilayer blue / Green film

Combined image quality :1 / 4-1 / 8

Diameter tolerance: + 0 / -0.12 mm

Center thickness tolerance :± 0.2mm

Focal length tolerance: ± 0.1%

Finish 60/40

Off-centre 1 '

Remarks: two-piece refractive double separation objective lens group;

Used for astronomical telescope objectives, finder and collimation objective Lens

Green Film: Four-sided multilayer wideband film (400-700nm)