A Barlow lens spreads light out and increases a telescope’s focal length. In this article, I’m going to show you how to increase the magnification of a telescope, specifically the one in the picture above. For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope. In general, when the magnification of scope increases, the image brightness, and field of view (FOV) decreases. Magnification = Telescope focal length ק Eyepiece focal length. Calculating Magnification (power) To determine power in a telescope, divide the focal length of the telescope by the focal length of the eyepiece. You will need to place the lens in front of the eyepiece. The magnification is the telescope focal length divided by the eyepiece focal length, in millimeters. This feature can be manipulated using different combinations of objective and eyepiece lens. For example, if you use a telescope of 1000mm focal length with a 25mm eyepiece, the magnification would be 40x (1000mm ק 25 = 40). An additional thing you can do to expand the magnification of your telescope further, is to add a Barlow Lens. Several factors affect the magnification of the telescope then, you can decide what should be the magnification of an ideal telescope for you. Telescope Magnification Formula. Our Overall #1 Rated Pick If you're looking for the best telescopes with excellent magnification that is affordable, easy to use for beginners, and has a great build quality, our top pick is the Meade Instruments – Polaris 90mm. It does so by magnifying the image. If the focal length of the objective is “F” and the focal length of the eyepiece is “f”, then the magnification of the telescope/eyepiece combination is F/f. For example, a 4″ telescope has a minimum magnification of 14x. This is 2mm larger than the typical dark-adapted human eye. So, a 14″ telescope used at 40x gives an exit pupil of 9mm. For example, a 1,000-mm telescope with a 20-mm eyepiece gives a relative magnification to our eye of 50× when looking through the eyepiece. With most professional telescopes, you will have to remove it every now and then in order to recalibrate. Calculating Telescope Magnification. Below the minimum magnification, the effect is to stop down the aperture. The role of the lens is to reflect, while the role of the eyepiece is to give a closer and more detailed look. An 8″ telescope has a minimum of 29x, and a 14″ telescope has a minimum of 50x. The magnification of a telescope and eyepiece is very simple to calculate. Increasing Telescope Magnification with a Barlow Lens. By exchanging an eyepiece of one focal length for another, you can increase or decrease the power of the telescope. The result is that the image being observed is magnified. 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