Given the low cost of this monocular, my expectations were not that high. My intended use was for wide field stargazing (at infinity). I was surprised by the screen resolution; it resolved and displayed faint stars well beyond typical optical binoculars of the same lens size. Response time was instant, there were no traces on the image at all. This part was an impressive surprise. I chose this device based on the size of the lens, thinking it would have the benefit of collecting more light before it was processed by the sensor/amplifier. Instead, it could have been an obstacle. The end result was more than disappointing as only the center hole (1/3) of the display came into focus. Heavy vignetting rendered the full 2/3 of the image unusable, this was just a taste of what *could* be there. The seepage from brighter stars/planets was significant and disruptive. Yes, the lens cap was removed during use. For terrestrial applications, it was *normal* to find animals raiding a bird feeder hours later. The illuminator was effective at long range (as long as there were no very bright objects nearby). However, the same focusing problems previously described were also evident in ground use. It can be difficult to tell a skunk from a cat at 50 yards. Nice novelty and probably practical, but I'm still looking.
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