I ordered several copies of this product because I liked to have a zoom which is not common for a trigger and wanted to share it around me ... I am quite satisfied with this product. I coupled to a pole for selfie and it makes me exactly the service I expected. reactive zoom. Triggering impeccable. Important point in the lot ordered an article proved to be defective. He immediately offered to send me to another or refund me. I opted for the second alternative and I immediately repaid. Congratulations!