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We use a Lucky Imaging system to obtain I-band images with much improvedangular resolution on a ground-based 2.5m telescope. We present results from a10-night assessment campaign on the 2.56m Nordic Optical Telescope and quantifythe performance of our system in seeings better than 1.0''. In good seeing wehave acquired near diffraction-limited images; in poorer seeing the angularresolution has been routinely improved by factors of 2.5-4. The system can useguide stars as faint as I=16 with full performance and its useful field of viewis consistently larger than 40" diameter. The technique shows promise for anumber of science programmes, both galactic (eg. binary candidates, browndwarfs, globular cluster cores) and extragalactic (eg. quasar host galaxies,damped Lyman-alpha absorbers).

Lucky imaging: high angular resolution imaging in the visible from the ground