I used to buy cheap slr cameras at yard sales and physically hold the lenses in front of my nikon. The result was usually an incredibly narrow depth of field with selective focus capability.
Whoah, Nelly, how do you do this? How do you prevent light leakage? Do you use bellows? Do you have super steady hands? Inquiring mind with a wallet too small to afford a good T&S lens wants to know.
Da Bing