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We present the first on-sky results of the micro-lens ring tip-tilt (MLR-TT)sensor. This sensor utilizes a 3D printed micro-lens ring feeding sixmulti-mode fibers to sense misaligned light, allowing centroid reconstruction.A tip-tilt mirror allows the beam to be corrected, increasing the amount oflight coupled into a centrally positioned single-mode (science) fiber. Thesensor was tested with the iLocater acquisition camera at the Large BinocularTelescope in November 2019. The limit on the maximum achieved root mean squarereconstruction accuracy was found to be 0.19 $\lambda$/D in both tip and tilt,of which approximately 50% of the power originates at frequencies below 10 Hz.We show the reconstruction accuracy is highly dependent on the estimated Strehlratio and simulations support the assumption that residual adaptive opticsaberrations are the main limit to the reconstruction accuracy. We conclude thatthis sensor is ideally suited to remove post-adaptive optics non-common pathtip tilt residuals. We discuss the next steps for the concept development,including optimizations of the lens and fiber, tuning of the correctionalgorithm and selection of optimal science cases.

On-sky results for the novel integrated micro-lens ring tip-tilt sensor