Raw Glass Blank Mirror DIY Newtonian Reflection Telescope K9 Glass 305/356/410mm

Description: K9 glass is a glass product made of K9 material, used in optics and telescopes. The composition of K9 is as follows: SiO2-69.13% B203=10.75% Ba0=3.07% Na20=10.40% K20-6.29% As203=0.36% Its optical constants are: refractive index=1.51630 dispersion=0.00806 Abbe number=64.06 The national standard for optical glass is classified by Abbe number. Glass with Abbe number>50 is defined as crown glass and is represented by "K", and glass with Abbe number<50 is defined as flint glass and is represented by "F". Under these two categories, light "Q"; heavy "Z"; special "T" and chemical element symbols plus prefixes, numbers plus suffixes are used for subdivision, and there are 18 categories and 141 grades. For example: QF8 (light flint) BaK11 (barium crown) K9 (crown) Generally speaking, crown glass belongs to the alkali silicate system, and most flint glasses belong to the lead silicate system. Currently, most reflecting objective lenses and some refracting telescope components use K9 optical glass. Delivery details --------------------------------------------------------------------- 1. We Ship to Worldwide. Please contact with us if didn't find your country. 2. Items will be shipped within 1-10 business days on payment received. 3. Delivery time depends on destination and other factors, it may takes up to 20 business days. Policy: --------------------------------------------------------------------- 1. We are not responsible for any custom duty or import tax. 2. We will leave positive feedback after receiving the payment. Please contact us if you are not satisfied with the item after receive it. 3. All messages will be answered within 1 business day. If you do not receive our reply, please kindly re-sent your message and we will reply to you as soon as possible. 4. Serious Buyer Only! Please place bid only if you agree with all the terms. 5. If you have any problems or concerns whatever with your order or products, please message us and give us a chance to assist you before you leave any feedback. We believe we can produce a positive outcome to any situation and will work hard to earn your praise.

Price: 155.99 USD

Location: 南阳

End Time: 2024-08-31T04:00:16.000Z

Shipping Cost: 29.99 USD