I love the idea of using C-mount primes, because they're so small and compact. I don't have the camera yet, but I plan on purchasing a NEX-3N for upcoming trips this summer (can't be weighed down by bulky DSLR gear). Any well-liked bang-for-your-buck C-mount lenses, or ones with surprisingly decent optics? Even as toy lenses, you can't beat the price . Also.. Can you go wrong with C-mount adapters? Will any of the cheapo $10 ebay adapters cause focusing problems? Any adapters confirmed to have infinity focus?