Dr. Dan 2010 » hobbies & crafts

Newton Mirror

November 19th, 2014

There is a system refractor, "apochromat", which has a shorter length of tube (focus), but facing more expensive. This type of Telescopes are often used for astrophotography. Refractor telescopes are useful for monitoring the open space and is not suitable for observation from the balcony or window. Although to be honest, to observe with an […]