Questions - Electronics
"How do I check digital TTL?"
What was very easy with analogue cameras proves to be more difficult with digital cameras. The method whereby you flash once into the camera lens at low flash power and then flash once more at full flash power with the lens closed is not to be used under no circumstance. When running such a test you could severely damage your digital camera´s sensitive sensor. Test your digital TTL always under real life circumstances by taking normal pictures on land and check the results on your camera´s and your flash display. With closed lens the emitted power should increase with the same object and distance to the object.