TTL Automatic Flashes — What They Do & How to Use Them
TTL-compatible speedlights perform two functions. The main one, when used on-camera, is to communicate with the camera during exposure measurement and providing the correct amount of light depending on the subject distance, lens aperture and ISO sensitivity. The major advantage when shooting with TTL-capable flashes is safety — you can trust the automated measurement system and take large series of shots while keeping your eye in the viewfinder, rather than checking the histogram after each shot. Some types of shooting such as event photography (weddings, parties, concerts, etc.) are essentially impossible to accomplish without a TTL flash at hand.
These speedlights however have another function that turns them into powerful tools in the hands of an experienced photographer. They can be used off-camera and be divided into groups (e.g. key and fill light, hair light, background light) and you can control the contrast between each group to achieve the desired artistic effect while still relying on the camera automatics to nail the exposure. This allows you to shoot fast and take many photos in semi-improvised conditions, without having to make careful adjustments by hand to each light.
Regardless of whether you intend to use one speedlight on-camera, or to work with several lights, the TTL-compatible compact flashes will give you the most complete set of creative capabilities. In our catalog you will find automatic TTL speedlights compatible with the Canon and Nikon systems, with parameters identical or similar to the original speedlights but priced much more competitively.
Yongnuo YN685EX is a top-class speedlight compatible with Canon EOS E-TTL, capable of providing big output (GN 60) and long throw (200 mm zoom). The YN685 can be operated in ETTL auto and Manual modes, as well as in stroboscopic (MULTI) mod..
The Yongnuo Speedlite YN600EX-RT Mark II is a powerful on-camera flash that provides feature parity and full compatibility with the Canon Wireless Flash System (both radio and optical). At less than 1/3 of the cost of the Canon 600EX-R..
Yongnuo Macro Ring Lite YN-14EX is a ring flash for portrait, product, macro and reproduction photography. Fully compatible with Canon ETTL/ETTL II. The YN-14EX is equipped with dual lamps which can be controlled together and separately to ..
Yongnuo YN658EX/N is a top-class speedlight compatible with Nikon i-TTL, capable of providing big output (GN 60) and long throw (200 mm zoom). The YN685 can be operated in i-TTL auto and Manual modes, as well as in stroboscopic (MULTI) mode..
Yongnuo YN585EX-P is the first compact flash of this manufacturer that is specifically compatible with the Pentax P-TTL automated exposure system. The strobe has a GN of 58 @ 105 mm (meters, at ISO 100) and has automatic (P-TTL auto) and ma..
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