судя по всему - самая дешевая вспышка с высокоскоростной синхронизацией (HSS)
инструкция:
http://www.cactus-image.com/Cactus%20AF50%20manual.pdf
в том самом инет-магазине, где продается продукция кактусов
информации минимум, но заявлена скоростная синхронизация, E-TTL II и ведущее число 50!
может, кто уже использовал?
каковы впечатления?


вот описание с сайта:
The Cactus AF50 is a solid performing flash with comprehensive features and a competitive price. The following are some of the outstanding features of this flash:
TTL
Fully supports Canon E-TTL / E-TTL II, the advanced programming and computerized circuitry of the flashgun provide correct amount of flash light output according to the camera's exposure measurement through the lens. If you prefer quick shooting and automatic flash power control, then the TTL mode of the Cactus AF50 is just for you.
Manual Flash Power Control
For those who usually opt for manual power control, a 5-level of "Power Ratio" (full power, 1/2, 1/4, 1/8 and 1/16) could be selected in M (manual) mode. The LC display automatically shows the flash-to-subject distance required for correct exposure.
Wireless TTL
The AF50 is equipped with an advanced wireless TTL can synchronize with a master flash through the lens, and enjoy creative flash in a multiple flash setup. Flash can now be fired from various directions without worrying about pre-flash from your camera which may trigger other flash units.
The above are only some of the features of the Cactus AF50. For a full list of other functions please refer to the specification.
For greater flexibility and creativity, the Cactus AF50 can be used with Cactus wireless flash trigger so the flash may be placed at any angle and at greater distance from your subject and camera. The lighting effects you can create are endless!
Purchase one for your photography setup today!
Specifications:
Auto Electronic Flash for Canon cameras;
Brand: Cactus;
Model: AF50;
Package Includes:
Cactus AF50 Auto Electronic Flash for Canon x1;
Soft Pouch x1;
Flash stand x1;
English user manual x1;
Compatible with Canon E-TTL, E-TTL II digital and film cameras including: Canon EOS 1100D, 1000D, 600D, 550D, 500D, 450D, 400D, 350D, 300D, 60D, 50D, 40D, 30D, 20D, 10D, 7D, 5D, 5D Mark II, 1Ds Mark III, 1Ds Mark II, 1D Mark IV, 1D Mark II, 1D; Rebel XTi, Rebel XT, Rebel XSi, Rebel XS, Rebel T3i, Rebel T3, Rebel T2i, Rebel T1i, Rebel, Kiss F, Kiss X50, Kiss X5, Kiss X4, Kiss X3, Kiss X2, Kiss X, Kiss N, Kiss, SX30 IS, SX20 IS, G12, G11;
Compatible with Cactus wireless flash trigger;
Guide number 50 m / 164 ft (at 105mm focal length and ISO100);
Supports Canon E-TTL / E-TTL II;
HSS High Speed Sync;
Front and rear curtain synchronization;
Wireless TTL for multiple flash control up to 3 groups;
Optical Slave function with 9 slave settings;
Adjustable output power in manual mode in 6 levels: full power, 1/2. 1/4, 1/8, 1/16 and 1/32;
Bounce: 0° / 45° / 60° / 75° / 90°;
Swivel: Left 0°-180° and right 0°-120°;
Automatic power zoom with manual control from 24mm to 105mm;
Red focus-assist beam and red-eye reduction;
Flash duration 1/1,000 - 1/20,000 second;
Recycling time: 0.5-9 seconds;
Power source: 4 x AA alkaline batteries (not included);
Power saving function;
Socket for firmware update;
Illuminated 2” LCD display;
Flash readiness display in camera’s viewfinder;
Metal hot shoe with locking pin (except for Sony);
Net weight: 250g