Other than the removable ones that come with some pens. After finally getting a omd that is free of issues, (third time is the charm) i was considering getting the fl600r.. But the more i consider it, the more i think it defeats the purpose of carrying a small system. Cause the fl300 is not powrful enough, and the fl600r is too big.. I have fast primes so i was hoping i wouldnt need it. 14, 25, 45 Thoughts?