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If you buy a Dobsonian telescope it is actually has a reflector telescope (also known as a Newtonian Reflector after the inventor Sir Isaac Newton) in the mount.

The mount is the lower part in this picture.

image.png.e8f6570efa3e84c679d262f3b8d3ac78.png

Dobsonian fitted with reflector telescope in the picture above.

 

image.png.509d2c5e0dd631070f4a847a2b62eae1.png

 

Reflecting telescope Optical Tube Assembly (OTA) only in picture  above.

 

The Dobsonian telescope was invented by a man called John Dobson. For more details have a look here https://en.wikipedia.org/wiki/Dobsonian_telescope

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