Method focal distance measuring autocollimation method, comprising the steps that establish an autocollimating flat mirror installed an autocollimating device by which the focal plane is formed autocollimating image on the optical axis of the lens in front of the first (last when the beam path of the best image plane) of the optical lens surface, this first fixed position, then, before the first (last when the beam path of the best image plane) over the optical Lens NOSTA set autocollimating concave mirror, the center of curvature of which coincides with the front principal plane of the lens, using autocollimation device formed autocollimating image in the rear principal plane of the lens, fix this second position autocollimating device and measure the focal distance of the lens, as the difference between the first and second count, characterized in that in a plane close to the focal together with the radiation source of the radiation receiver mounted matrix eniya with imaging device lead autocollimating image of the radiation source, reflected by a plane mirror mounted in front of the first (last along the beam from the focal plane) of the optical lens surface in the plane of the radiation detector array are moved rigidly bonded assembly source - the matrix detector in a direction towards lens or away from the imaging device for observing the image of the source are the best image plane (focal plane) of one of the known criteria
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