Is the problem of the lamp itself rather than the instrument, the center of the optical axis is not too bright. The surroundings are bright. The knob of the vice part is not a thing like a common butterfly screw, but it is a stick type knob like a sako, so I thought that it is easy to put in force, but as ease of use preference can be divided?
With the use of about 2 hours a day, I used the light for one week and the light bulb broke. I stuck to cheap and bought it, but why do not you do too low a lifetime? I do not seem to be able to buy a replacement bulb here, which is inconvenient. I will not buy it anymore.