Ostara Achromatic 2x Barlow Lens RRP £36.99 Save with Buy It Now + Free UK Postage Doubles Eyepiece Magnification - Standard 1.25" (31.77mm) Fitting - Achromatic Lens
What Magnification is this Eyepiece? The magnification produced by an eyepiece depends on the optical system it is used in. In a standard astronomical telescope the magnification is found by dividing the focal length of the main tube by that of the eyepiece. For example, a 1000mm scope tube used with a 10mm eyepiece gives 1000/10 = 100x magnification. Used with a 5mm eyepiece gives 1000/5 = 200x.
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