Sea Tidbits: binoculars relative aperture (ie the ratio of the focal length of the objective lens diameter) than the average large telescopes, while the relative aperture brightness proportional to the square planar celestial bodies in the telescope, which is the ratio of astronomical binoculars telescope suitable for observing celestial planar reasons. In the description of many binoculars often referred to "exit pupil diameter." It is with respect to the entrance pupil diameter (ie telescope aperture) in terms of the Jay and telescopes price, it is the diameter of the light beam enters the objective lens converge when the observer. Numerically equal to the ratio of the objective lens diameter and magnification, such as 10 × 50 binoculars exit pupil diameter is 50mm / 10 = 5mm. Taiyuan sea Tips: Under normal circumstances, the visual telescope monolayer antireflection coating of yellow-green 5500 Angstrom antireflection effect the best Jay and telescopes, because the human eye is most sensitive to such light. It reflected away from the blue and red wavelengths on some more, so we see a single film coated lenses are blue purple or red. Plated multilayer film lenses were pale green or dark purple kit and telescope manufacturers, thick monolayer film will look appear green, some foreign manufacturers have found a way to purported multilayer film, but it reflects a light than the real multilayer film to be much stronger. Jason and Jessie Hill offer _ telescope and binoculars _ provided by the electronic breeze sea breeze Electronics Co., Ltd., Taiyuan. Taiyuan sea breeze Electronics Co., Ltd. (www.tyhfdq.com) strong, credible, in Taiyuan, Shanxi telescope industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead breezes into the brilliant electronic and you work for a better future!