This awkwardly-named device is a Holga DSLR lens with its focusing mechanism removed and a frankly kind of sweet special-effects filter system attached instead. The "SLF turret" accepts two special effects wheels (included) which include a range of colour and prismatic effects. You rotate the wheel to slide a new filter effect over the end of the lens, and you can swap them in seconds with a clever magnetic attachment system. It's a lot more slick than anything Holga has the right to be. Now, it's still a Holga lens, and a fixed-focus one to boot, so expect softness- but it's kind of fun all the same. In excellent condition, with original box.