D104F800 DIY Astronomical Telescope Objective Glass Mirror Lens Multilayer Film

Description

Multilayer film D = 105mm and F = 800mm for astronomical telescope objective
Diameter: D104mm
Focal length: F800mm
Coating: multilayer 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
Eccentricity: 1 '
Remarks: two pieces of double glue lens group;
Used for astronomical telescope objective, star finder and collimating objective
Package include:1pc
（Need a large amount can contact me, the price can be discounted
there is any VAT tax that happens during import in the buyer's country, it should be paid by the buyer.
Please do not leave a negative feedback before contacting us. Problems can be resolved through friendly communication.
Thanks for your understanding.
Payment:
We accept only PayPal payment ,Please make the payment with 7 days after end of auctions .
Thank you,Please make sure your  shipping address is correct,We accord to your "eBay" shipping adress for shipping.
Shipping Instruction:
Usually we offer HongKong air parcel and take 25_35 shipping days.
we will ship out your item in 24h after a your safe payment(saturday post off working).
IF you need fast shipping please contact us for shipping fee and fast shipping need offer buyer'Tel No. otherwise item can't be ship out.
If you do not receive your item after 30 days please email us. after 35 days still do not receive your item.
we will give your refund or replacement.  Strive for the best service is our tenet!
We think no thing can't be slove after good communication from both side.
we will reply all your message and emaill in 24h (may sometimes canot reply in time as the time difference)
About feedback:
When you receive the item and satisfied with the product ,
please leave us positive feedback and 5 scores DSR.
We will leave 5 Scores DSR feedback for you.If ,for any reason you are not satisfied with your purchase,
please contact us via Ebay Message and we will do our best to resolve it ,
Do Not leave neutral or negative feedback without any communication with us.
Return Policy:
5. Please contact us before return.
6. All items will be tested before shipment, please do not use the items or damage it, used or damaged parts are not acceptable to return.
7. Buyers are responsible for all cost for shipping & reshipping.
Feedback Policy:
1.Positive feedback will be appreciate if you are pleased with your purchase.
2.Before you make a negative or neutral feedback, Please contact us. We will solve problems for your satisfaction.