You should explain the situation to the Judge. Go into the Clerk's Office and motion up the ticket. Explain what you did and the Judge should restore the original fine amount.
Seth Weinstein, Esq.
Practicing throughout Southern California
This reply should NOT be considered a legal opinion of your case / inquiry. At this time I do not have sufficient factual/legal documentation to give a complete answer to your question and there may be more to the issues you raised then I have set out in my brief reply.
My colleague is correct. The big question is that you did not have to get this ticket if your friend did not turn you in. You have to see if you can get this on calendar and explain to judge what happened.