Yes, there are optically correct housings.
Are you looking for situational awareness application, flight test or broadcast?
Situational awareness (IFE, safety) or flight test try Securaplane. Generally these are hermetically sealed units that you cannot open up but they are fully qualified and FAA approved.
Broadcast - do a search on a NAB website (National Association of Broadcasters). The Clay Lacy camera is a broadcast / cinema application.
I think there is also a company that makes faired camera / sensor pods for scientific instruments. If you are still needing info let me know and I can dig through my archives and find the name.
Aeronavis