I had been looking long for an external flash unit, which also supports the TTL flash control of the camera. This flash is suitable for Panasonic / Olympus cameras and works with the camera's internal flash control together. In addition, you can sync it to 1st or 2nd curtain and even put in slave mode. In manual mode is also still leaves the power to reduce or increase in several steps .This may be necessary if the control range of the TTL control device to its limits, for example at close range. Furthermore we offer a calibration of the device according to its own Vorstellungen.Allerdings must these instructions in www. retrieve web address is printed on the Quick Start Guide! In my judgment, the device works well in conjunction with a Panasonic Kamera.Die exposure is balanced, the illumination of the images good.The camera control is handled within the limits, only the absolute proximity is overexposed, like most devices. The flash turns in automatic mode with the camera off and on again. The LZ 33 at ISO100 is normally ausreichend.Sollte you need more, you can still get the ISO to 800 or higher gehn.Damit distances are then to bridge easy to 15m! I have the equipment chosen because the customer reviews essentially only positively reported it. Also, the price is very attractive, it is a mere 33 - 40% of a simple Panasonic Blitzer. In conjunction with my GX7 Panasonic tremendous work exemplary, I found no disadvantages compared to an expensive device. A small restriction might still be of importance: Since the GX7 and many other system camera have only a small depth, the camera with a very fast lens baukurzen instabil.Diesen effect amplifies the natural patch flash yet, everything is a bit more cumbersome. However one has a powerful flash with enough reserve! The flash rate is quite ordentlich.Wird not accessed the full flash output, one arrives at very short Blitzfolgen.Eine complete recharging takes before 5s. I can not say anything about the battery life. For mechanical fuse can fix the flash with a Plastikrändelmutter - works very well. One more note: The camera should be at the exposure could not stehen.Ansonsten on spot or point the image is not properly exposed, because only part of the correct lighting detects wird.Also adjust exposure as possible to the entire measurement field, unless it is specified otherwise.