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Astronz 10" f/4 Newtonian OTA


A large aperture, robust 10" telescope optical tube assembly. The classic reflector, 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 Crayford focuser, a rigid steel tube and short focal length make these telescopes ideal for astrophotography as well as visual observing. 

The 10 inch (254mm) primary mirror collects 56% more light than an 8". Images are bright. Planetary nebulae will be full of details that cannot be seen in smaller scopes. Galaxies will reveal their spiral arms. Planets and the moon can be viewed in stunning detail. The limit on what you can see will not be the telescope, it will be the observing conditions. 

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 Crayford 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.  

Recommended For
What's In the Box?
  • 10" (200mm) f/4 Newtonian optical tube assembly
  • 2" 10:1 linear bearing focuser with adaptor for 1.25" eyepieces 
  • Tube rings
  • Dovetail 
  • Cooling fan 
Optical design Newtonian
Primary mirror 10" (254mm) BK7 glass with surface quality better than 1/16 wave RMS
Focal length 1016 mm  
Focal ratio f/4 
Highest practical magnifcation 500x 
Focuser  2" 10:1 linear bearing with adaptor for 1.25" eyepieces
Tube length 980 mm 
Weight of tube 15.3 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.