Review on Jiusion 2560X1440P Microscope Cellphone Magnification by Andrew Frison

For a microscope that is $28 plus tax, this is great value. The quality you get for it is fair. I have not conducted an objective study to determine if the 2K pixel claim is true. What I do know is that if you increase the resolution, the image quality is objectively higher than 640x480. I have another snake camera that offers a higher resolution but still gives an effective resolution of 640x480. You just get more identical pixels for the same pixel at a higher resolution (high resolution). One thing this scope offers is a wider field of view for higher aspect ratio resolutions (in fact, 4:3 resolutions just appear like a cropped version of 16:9 resolutions) - that's both a blessing and a curse for this scope . . . The wider field of view seems like an advantage as you can capture a wider field of view at a given magnification, but this is where this scope pushes the limits of cheap optics in this scope - for 16:9 resolution settings you can clearly see that for a completely flat subject, only about 1/3 of the image can be brought into focus in the circular area at the center. You can rotate the focus ring to bring the outer area into focus, but the center view will be blurry. This is the result of cheap optics that are poor at focusing evenly across the entire field of view. I also noticed that the image of the grid pattern on the supplied calibration card gives the outer edge a blurred appearance, consistent with the circular focus area described above. I may have been spoiled by professional microscopes that offer a flat, wide field of view when everything is in focus. Not this microscope. The sensor itself is excellent and capable of producing a high resolution image, but the optics do a terrible job of delivering the image to the sensor (especially for 16:9 aspect ratio modes) . The bottleneck of this system is a cheap plastic lens. I would be willing to pay another 10 euros if the manufacturer can improve the quality of the optics. Edit September 13, 2021: I think I know what happened here. They used the same optics, body, etc. as the previous (non-2k) model and put in a higher resolution (and wider) sensor that extends the optics originally designed for the previous generation. I understand that the previous generation sensor was most likely a 640 x 480 (4:3) sensor and this one is most likely a 1920 x 1080 (16:9) sensor. It's still around 7x pixels in mode, but I have to wonder if the pixels on the outer edge of that wide sensor are very useful given the difficulty of focusing on things at once. In a way, the $20 model is very effective as the looks are right and the price is really high. On the other hand, even if you ignore/crop the outer edges of this microscope's images, the resolution is still higher than other models. For $8 more than I bought it, it's worth it. You just have to understand the warnings. I want to reiterate that the manufacturer should introduce a "2K+" model that simply improves the lens. This would be a big improvement.