Whats a Barlow lens?
Put very simply, a Barlow is an additional magnifying lens. You screw the eyepiece into the Barlow, and the Barlow goes into the focuser of the scope. If you’re using a telescope at a magnification of x60, adding a 2x Barlow will produce an effective magnification of x120. However, the image will be dimmer for two reasons – first, because it’s spread out over twice the area, and secondly because some light is lost in every piece of glass in the system.
