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Astronz 8" f/4 Newtonian OTA


A simple, robust 8" (200mm) telescope optical tube assembly. Ideal for astrophotography and visual observing.

The classic reflector design that is simple, robust and easy to use. Newtonians give you a large aperture at an affordable price. High quality optics, a precise Linear Bearing focuser, a rigid steel tube and short focal length make these telescopes ideal for astrophotography as well as visual observing. 

The Astronz-GSO 8" Newtonian has a 8 inch (200mm) primary mirror with a focal length of 800mm and a focal ratio of f/4. It gives clear, bright wide-field views of deep sky objects such as galaxies and nebulae. An 8 inch telescope will also show stunning views of the planets and the Moon. 

GSO mirrors are made from optical quality BK7 glass and are limited only by diffraction, which means they achieve the theoretical maximum resolution possible for the size of the mirror. They are machined and polished to better than 1/12 wavelength, sometimes 1/16 wavelength, which is considerably better than the industry norm.  

Apart from the quality of the optics, this telescope has a number of features that sets it apart. The steel tube gives much more stability than inferior aluminium models. The self-centering 2-speed Linear Bearing focuser gives more precise eyepiece alignment. And there is enough back focus that you can attach a standard DSLR camera for astrophotography. 

This is the optical tube assembly only, and does not include the mount or eyepieces. 

A 8x50 Finder, vixen dovetail bar and tube rings are included.

Recommended For
What's In the Box?
  • 8" (200mm) f/4 Newtonian optical tube assembly

  • 2" 10:1 Linear Bearing focuser with self-centering adaptor for 1.25" eyepieces 

  • 8x50 Finder

  • Tube rings

  • Vixen Dovetail 

  • Cooling fan 

Optical designNewtonian
Primary mirror8" (200mm) BK7 glass with surface quality better than 1/16 wave RMS
Focal length800 mm  
Focal ratiof/4 
Highest practical magnifcation400x 
Focuser 2-Speed Linear Bearing 2" focuser with self-centering adaptor for 1.25" eyepieces
Tube length730 mm 
Weight of tube9 kg 

This product is normally shipped by our freighter service.

Normal delivery is to pickup from their local depot or for delivery to a business address in main towns or cities.

Delivery to a residential address will incur a $45.00 surcharge.

Delivery to a small town or rural address may not be available. We will contact you separately to arrange shipping.