12.5mm Glass Achromatic Double Convex Lens for DIY Astronomic Telescope1pc

Description

12.5mm Optical Glass Focal Length 40 80 100 125 mm
Achromatic Doublet Double Convex Lens DIY Astronomic Telescope Objective Lens Biconvex 1PC
Specification
Material Optical K9+ZF2 Glass
Diameter: 12.5mm
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Focal length: F=40mm
Tc1=3mm Tc2=1.3mm
R1=24.28mm
R2=-18.0641mm
R3=-52mm
Finish: 60/40
Eccentricity <3 points
Surface anti-reflection coating @400-700nm
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Focal length: 80mm
T1=3mm T2=1.3mm
R1=55.23mm R2=-33.18mm
R3=-84.53mm
Plating 400-700nm antireflection coating
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Focal length: 100mm
T1=3mm T2=1.3mm
R1=73.7mm
R2=-39.83mm
R3=-96.37mm
Finish: 60/40
Eccentricity <3 points
Surface anti-reflection coating @400-700nm
~~~~~~~~~~~~~~~~~~~~~~~~~
Focal length: 125mm
T1=3mm T2=1.3mm
R1=100.08mm
R2=-46.88mm
R3=-109.15mm
Finish: 60/40
Eccentricity <3 points
Surface anti-reflection coating @400-700nm
Return or Exchange
If you are not satisfied when you receive your item, please return it within 14 days for a replacement or money back.
Please contact me before you return it.
If item is defective in 3 months, We will send you a replacement without extra charger, or offer refund after we receive the defective item.
If item is defective after 3 months, you can still send it back to us.
We will send you a new one after receiving the defective item. But you have to pay the extra shipping fee.
Policies
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Shipping
We Ship to Worldwide. Please contact with us if didn't find your country.
Items will be shipped within 1-10 business days on payment received.
Delivery time depends on destination and other factors, it may takes up to 20 business days.
On Aug-13-20 at 01:10:21 PDT, seller added the following information: