Photographers amateur or professional, flash cobra is an indispensable tool for flash photography! Indeed the result of photo has nothing to do with the photos made to the flash built into your camera. It helps to have a more diffuse, more natural light and with a higher power. Offspring the cobra to the brand of your SLR flash are quite dear, some 100aine euros. For these reasons, I decided to try a Speedlight, the Aperlite Kit flkash PRO YH-500N, which displays the same characteristics as one big but for much cheaper.
Content of the box and technical features:
- 1 x Flash cobra YH-500N or YH-500 c (Nikon or Canon)
- 1 x case for flash
- 1 x foot of flash with no screws Kodak
- 1 x manual (English)
- Circuit design: Bipolar Transistor (IGBT) insulated door
- Guide number: 58-100 ISO (105 mm) to the maximum
- Flash modes: TTL, M, Multi (strobe)
- Wireless modes: TTL, S1, S2
- Flash coverage: 24-105mm
- Vertical angle: 0 to 90 °
- Horizontal angle: 0 to 270 °
- Internal power supply: 4 AA batteries
- Battery life: 100-1500 flashes
- Recharge time: 3 seconds
- Color temperature: 5600K
- Flash duration: 1/200 sec to 1/20000 sec
- Adaptation of power: 8 levels of output control (1/128 – 1 / 1) and 22 levels of fine adjustment
- Size: 200x75x57mm
- Weight: 368 g
The test
Flash is well packed in a house of protection which looks waterproof, with fabric inside. This house transport is very flexible and will not shock however protect him, so pay attention. The foot of the flash to use remote looks solid, it is hard plastic, and above all, if you want to fix it on a tripod, underfoot is a Kodak screw step which is steel! This is not always the case for flash cobra under 100 euros! First impressions of the flash are so he looks solid and well made. On the side, there is a hatch to put 4 AA batteries to the vertical, the first time of use, the door is hard to close, but it's a matter of hand, got it very quickly. For fixing the flash on the camera, drag the claw of the flash on the hot shoe of the camera door, and then it must tighten the closing wheel that comes against the top of the hot shoe of the camera door. It's easy to close and easy to open. When it is locked and we move the camera in all directions, the flash is good despite are weight about 400 g, battery included. The flash head is completely mobile, from left to right and from top to bottom to calibrate better its light during a shooting. 
To turn it on, there is a button switch ON / OFF easy to use. Flash has 5 modes, interchangeable with the 'mode' button. There TTL mode and manual, the strobe (multi), the Slave 1 mode mode mode mode Slave 2. The zoom button is there to change the zoom of the flash (the light source moves more or less close to the protective glass of the flash to condense more or less the beam of the flash). The zoom is 18mm to 180mm, with 10 other intermediate values. The pilot for his button to manually trigger the flash to see the flash generated in the setting used. In strobe mode, keep pressing the button driver, the strobe multi-flash will be fired as long as you're pressed, until the number of trigger set in this mode. There is a red LED that indicates the flash recycling, IE are level load. For example, after a power flash 1/1 (maximum) the LED will blink 2-3 seconds to recharge the flash. Small notes, if you press this LED, the effect will be the same button the pilot, that is to say that the flash is triggered manually, and if you press the pilot button while the LED flashes again, the flash fires the same but only sends what he has already reloaded. For example if you use the flash in power 1/1, you start him once with the pilot button, you press again until the LED finishes flashing, after 1 second, for example, the flash fires but will not be asked to 1/1 power as not yet fully recycled. Pay attention to this detail. When the flash is controlled by the camera on the other hand, it will not fire as long as it doesn't have enough power stored in the capacitor. This feature of manual release of the flash with the pilot button can also be used in a photographic technique called open flash, it comes to freeze a very fast movement in a dark room, a long exposure and flash or multi-flash used to freeze the object during the Flash of light. 
The flash has 2 outlets, a PC socket that allows synchronization between the flash and the reflex without claw and a type battery external power intake to increase the autonomy of the flash (in the photo studio for example). These two cable not provided however, but are generic, not need a cable of a specific brand. There is also a receiver for remote control of the flash. When the flash is installed and the camera turned on, the flash is detected (only market at Nikon and Canon, flash YH-500 is available in model for Canon and Nikon). You can see the flash on the camera settings but can't change it directly on it, use the buttons provided on the flash. When we support the shutter button to focus, there is a beam to support autofocus. In TTL mode, this is the device that determines the power of flash to use, flash knows the camera ISO setting and the lens aperture, flash zoom fits also depending on your lens if you use a zoom type lens. It is possible to manually change the composition of the exposure for small changes compared to the flash based on the made wanted to. If you have another brand such as Pentax or Sony camera, know that the flash is also usable, there is however not TTL mode or the automatic zoom, for example. Communication between flash and camera will be limited to the outbreak and therefore, it will use it in manual, multi, or slave. The manual mode allows to vary the power and the focal length of the flash manually and the strobe mode allows the same thing by adding the dimension of time and frequency settings. It is possible to go up to 100 Hz. For such low frequencies which 1 to 3 Hz, with weak powers of flash it is possible to go up to 90 scheduled triggers. S1 and S2 modes to take pictures with the flash deported without remote control. Handy for photos with several flash (not necessarily of the same brand). S1, the flash mode will be triggered when he sees another flash. S2 mode to do the same thing, except that the flash fire to the 2 nd flash (when there is a pre-flash before the main flash). 
At the level of power, this flash to a power displayed in number guide 58, making it a powerful enough flash for almost all common situations (illuminates to 58 m at ISO 100 at maximum focal length of the flash). You can adjust the power of accurately with 8 levels of control ranging from 1/1 to 1/128 and 22 intermediate setting (f-stop third) levels. In case of heavy use, there is a security system which protects the material overheating. After 2 minutes of non-use, flash goes to sleep and when you turn it off, all the settings of each mode remains in memory. However, this model does not have high-speed Sync to take photos more than 1/250sec but this options exist on other flash of the brand.
Conclusion
This flash is a good surprise, because a system help to autofocus and the TTL in a flash less than 100 euro gives it excellent value! It is of good quality, the Recycle time is correct and it will meet most of the needs of a photographer. It is also easy to used, it is a good solution as first flash for example, both comprehensive, efficient and inexpensive. If you need high sync speed, think about a flash a bit more high-end also available at Aperlite. Whatever it is I recommend. It's a great flash for amateur and professional that is not very expensive next to the mark flashes. If you do not have Canon or Nikon, the flash can also be used, but the TTL mode is not functional, it's a shame but maybe in the future, the range will be extended to other brands. Link: https://www.amazon.fr/gp/product/B00VFFXMX6/ excluded! Discount coupon-20% 06/09/2016 2016-09/10: Code D2A7XLNA to insert on Amazon during the validation of the basket. 