Refracting Telescope of Dollond

Another astronomical telescope worth mentioning is the Dollond refracting telescope.

This refractor with glass and brass as the main materials was assembled and built by London optical instrument maker George Dollond in the year 1836 in England.

Some of the important optical specifications and qualities of the Dollond refracting telescope are:

This refractor’s focal length is 0.3 meters or 300 centimeters. Focal length is the length of the path from the lens to the eyepiece through which light passes.

Length and height are both measured at 18 centimeters.

The refractor’s aperture is measured at approximately 18 centimeters. The aperture is defined as the diameter of the primary mirror or lens of the telescope. The higher the value of the diameter of the mirror or lens, the more vivid and detailed with be the image.

The Dollonds – famous astronomical and refracting telescope builders

George Dollond was a famous European inventor, optician and eyepiece maker. His scientific inventions were important gadgets utilized not only in the field of astronomy, but also in navigation.

George Dollond, together with father John and uncle Peter, became very famous all over Europe as being great builders and inventors of astronomical telescope equipments, as well as reliable navigation gadgets, equipments and instruments.