This has been my most complex conversion so far. I removed the lens and shutter assembly from a Holga 120N and replaced it with a Compur size 0 shutter. I then mounted a 65mm f5.6 Mamiya Sekor lens onto the shutter. The lens was mounted too close to the film plane to focus on infinity, so my first thought was to just take out of focus pictures, which might look cool. After thinking about it a bit more, I hit on the idea of using close-up lenses to see if I could get the lens to focus normally. After a bit of searching on Ebay, I came across a cheap set of close-up lenses of the right size, and after a bit of experimenting settled on a +4 lens for normal distance work.