High-precision Parabolic Lens DIY Newtonian Reflection Primary
Mirror of Astronomical Telescope D 150mm Focal Length 600 750mm


Specification

Parabolic Lens
 Diameter: 150mm
 Focal Length 750mm
Focal ratio (the ratio of focal length to diameter) F1.2 or more can be done.
 Lens accuracy: Parabolic Lens surface accuracy PV is guaranteed to be better than 1/10 light wavelength, 

and spherical aberration is less than 1/15 wavelength. 

The mirror blank is made of K9 material and some high boron silicon materials. 

The thickness of the lens is 1/8-1/10 of the diameter.
 The aluminum coating is added with a silica protective film, and the coating can be used for 8-10 years under moisture-proof storage. 

Occasionally, there will be very slight scratches on the surface, which are basically invisible and will not affect use.


35mm secondary mirror:

Elliptical plane mirror, short axis D = 35 mm

Caliber D (short axis): 35 mm

Side thickness H: 10mm

Surface accuracy λ: 1/4

Tolerance: ± 0.5

Coating: aluminized and protective foil


Return or Exchange

  1. If you are not satisfied when you receive your item, please return it within 14 days for a replacement or money back.
  2. Please contact me before you return it.
  3. 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.
  4. If item is defective after 3 months, you can still send it back to us.
  5. We will send you a new one after receiving the defective item. But you have to pay the extra shipping fee.


Policies
  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.
  6. We believe we can produce a positive outcome to any situation and will work hard to earn your praise.

Shipping
  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.


DataCaciques