131mm Optical Telescope Objective Lens Dual Separation DIY Refractor Achromatic

Description

131mm Large Optical Dual Separation Doublet Lens Focal Length 1200mm 700mm
DIY Refractor Telescope Objective Achromatic
Guidscope
Lentes
Dual  Separation Achromatic Lens
Material: Optical Glass
Lens Diameter:131mm
Focal Length:700mm( Green Film)  1200mm (Blue Film)
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)
Delivery details
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