Fix single constructor case for makePrisms
Fix single constructor case for makePrisms

Issue 231

omefire/lens,Icelandjack/lens,hvr/lens,hvr/lens,timjb/lens,Fuuzetsu/lens,ddssff/lens,cdepillabout/lens,rpglover64/lens,cchalmers/lens,Gabriel439/lens,danidiaz/lens