The YongNuo YN-565EX is a TTL flash with guide number GN58 @ ISO100 that measures light while exposure, thus giving you excellent quality photographs. This YongNuo flash works with both auto as well as manual zoom, making it highly versatile. The rear-curtain sync feature of this Canon flash allows you to freeze motion at the end of exposure. Supporting cameras with 24-105mm focal length, the YongNuo YN-565EX allows you to shoot landscape photographs easily. The FE lock feature of this Canon flash ensures you have appropriate subject exposure, even while reframing. This YongNuo flash is protected from overheating, which makes it last longer.