Traffic cites can be tremendously expensive. I would suggest you put this matter on calendar in Division 10 and speak to the judge. If you are willing to accept responsibility early on, I would bet if this is truly your first offense, he will lower your fine significantly.
Mr. Wilfert is correct. Very often, in Ventura County if you put your case on calendar you likely will get your fine lowered. Some charges have minimums that restrict the judges ability to lower them. There has been some recent turn over regarding the judicial officers in Dept. 10 in Ventura, so I am unsure how this particular charge is being handled by the Judge.