Are located on the back of the ring 4 detents by pressing a button, they are withdrawn and give the adapter ring free. About this locking lugs of the LED ring can also be fixed on the control unit (good solution).
Operation is simple: a knob to turn and change the brightness. The difference between minimum and maximum is about 1: 3, according to manual should be 1/4 power setting "QTR".. Between "HALF" and "FULL", the difference is about 1: 1.6.
In three buttons. The left switches to flash, the right to permanent light, the middle between left half, right half and both to together. The green indicator LEDs above would not be so bright.
In a darkened room, the device produces so much light that it at ISO 200 and F4.0 for a shutter speed of 1/80 sec is enough. Distance 50cm it.
In flash mode the LEDs go when focusing with reduced brightness, when triggering is increased to the preset brightness and that's even with "QTR" brighter than the focusing light. About 6 seconds after the image the LEDs back then. In flash mode the full brightness of 1/160 s in ranges F4.0 and ISO 200th
Whether the color rendering index (CRI) is really> 96, I can not measure. And my camera will probably have a certain color variation itself. Basically see colors very natural, turquoise lack a little freshness, slight deviation towards blue. Also red is not so bright. But this is only minimal. Mounted on a push by 67mm adapter is the illumination from 50mm focal length without vignetting.
Oh yes, this imaginary for Nikon Ringlight also works on Pentax dSLR.
