Back Focus is a mechanical adjustment for focusing a camera. It moves the image sensor in relationship to the lens to allow for different back focal lengths of lenses. This is important when fitting a zoom.
great product. I use it for vehicle camera recording. I wish there were a mount for the monitor.
Henry from Jackson, LA
Your customer service is great. They are very helpful in purchases if I have questions. Your quick response is very helpful to my emails or calls. I also wanted to pass along the tech help when we have had problems with equipment. There seems to be an interest in getting all items to work how we intend them to. I will continue to use you as a source for security camera equipment needs. This order was just one of many we have placed. Outstanding!!
Tom from Champaign, IL
I have been ordering from Bill and Advance Security Products for nearly ten years. I have never been disappointed or had anything but the best in customer service from this company. I have \"price-shopped\" on the products I buy and always end up coming back to Bill for the purchase.
-Donna - Overland Park, KS
Donna from Overland, KS
Very pleased with everything. Had one question about operation, sent a e-mail, had the answer the next morning.
Bobby from Hampton, VA
the quality and clarity of the camera is outstanding.