With so many good reviews, I'm wondering if I'm standing on a fake. In general, the block was missing some hardware, but I figured out how to get it working. I set it up and started with a 25mm lens. It works well! As others have noted in the reviews, it's difficult to get this device to shift slightly to see objects (up/down and left/right). It was so hard to move at first that I had to press hard on it. Then he became so relaxed that he couldn't take it anymore. I removed a few covers to access the hex screw that holds the device together. It has a design flaw that resolves as it moves up and down. If you don't move it, it's ok. I tried to combine this with a 3x Barlow lens. Unable to focus clearly. It is clear that this is a very cheap lens. I switched to a 10mm lens. I couldn't focus it. I've been working on it for a long time, researching on the internet and eventually noticed a small bubble on the edge of the lens. I'm not an optician, but I know full well that a small imperfection can cause big problems. After working on it for about an hour, I decided to move on. Finally a 5mm lens! It should be a stunning lens that takes you closer to the stars! Like the 10mm lens, this lens had a bubble and was impossible to focus on. About 30 minutes of work on it in vain. While the 25mm lens works great, 1 out of 3 lenses just works ridiculously. The Barlow lens is cheap and useless. While I'm not expecting an amazing telescope at this price point, it should be decent for a beginner. This is missing and will be returned.
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