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Bird Jones Telescope. This means that there must be something to double the effective focal length which would be the. Seronik or Carlin assume a classical Newtonian design.
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A true Newtonian has a primary mirror with a parabolic curvature and a flat angled secondary mirror. A Bird-Jones or Jones-Bird depending on who you talk to Telescope aka Bird-Jones Newtonian Bird-Jones Reflector Jones-Bird is a derivative of the Newtonian telescope design. Jones-Bird A Jones-Bird reflector telescope sometimes called a Bird-Jones is a mirror-lens catadioptric variation on the traditional Newtonian design sold in the amateur telescope market.
The Bird-Jones design uses a spherical primary and a fast one at that in an attempt to keep the tube shorter than average.
Most collimation instructions eg. This alone is a reason why not to buy this telescope. It is using a permanently mounted Barlow lens in the focuser to increase the focal length which is degrading the quality of the image. The Bird-Jones design allows having a physically small telescope with long focal length.
