The simple joys of DIY tilt-and-shift lens on a Pentax DSLR.
You need old K mount lens to unscrew off the mount ring, old lens to disassemble for the front element (here I have used the Helios 44-2 58mm f/2, extremely handful for the purpose), packaging paper and sticky tape for the improvised bellows, and 2 metal ring clamps to hold all together. The $20 result is below, ready to roll, together with the sample pictures gallery.