Just my two cents -- I don't think there's any reason to do this. I suspect that the Hollywood studios are under contract to show the product it was shot on, etc. That's probably just part of the deal, for getting the product for a particular price, or whatever. I don't think they put it there to look more professional. I could be wrong, but my instincts are telling me that those end-credit logos are nothing more than contractually-obligated advertisements.
"Regular" audience members don't notice that crap. The only people who would notice your logos in the credits would be filmmakers, and we'd all be like, "so what?" In my honest opinion, you wouldn't really be accomplishing what you're hoping for, and would only be giving Canon free advertising.