Pentax lenses can be picked up incredibly cheaply on Ebay or similar auction sites. Some have been available in the range of £10-£20 for a Pentax 28mm f2.8 lens as per the one I did these tests with.
The Pentax to Canon EOS adapter allows you to connect your Pentax K lens on your Canon EOS Camera. In this example I first added the adapter to my Pentax 28mm f2.8 lens and then fitted this to my Canon EOS 550D camera.
|Pentax to EOS Lens converter|
|Photo using Pentax K 28mm lens on Canon EOS 550D|
|using Pentax K 28mm lens on Canon EOS 550D camera|