Found some cheap rear lens and body caps on eBay. Too bad I couldn't buy just rear lens caps by themselves, I guess I'll just have a lot of body caps now as well. I also found some double sided adhesives lying around the house and by combining these items I made myself back to back rear lens caps. What can I say, it's a boring Tuesday off work. 9-18/4-5.6 and 17/1.8, creamy bokeh provided by 25/1.4.