Bahtinov mask for lunar imaging?

[michaelmorris]

Has anyone tried using a Bahtinov mask for focussing on the Moon? I realise that focussing masks are designed to work on points of light rather than extended objects such a planet and the Moon. However, it struck me that if one used a bright reflective point on the Moon (Proclus for example) and delibrately overexposed it one might be able to induce similar fiffraction patterns as one gets for stars.

[Psychobilly]

dont work well at all