Review on 🔍 Andonstar AD407: High-Resolution 3D HDMI Soldering Microscope with 4MP UHD, 7 inch LCD Screen, and USB Video - Ideal for Phone Repairing, SMT, SMD, DIY by John Larsen

The photos and resolution are amazing! But the zoom is so narrow that it's not designed for soldering or PCB inspection. However, it is well suited for close-up inspection of circuit boards. I tried a macro lens but it was blurry around the edges. I ended up 3D printing my own 100mm tube extension to solve the depth of field issue. The 100mm extension worked a million times better than the macro lens. I saw another user video on youtube of it attached to an articulated telescopic mic and light stand. That was also a very good idea. In the meantime I am very satisfied with my pipe extension. It would be interesting to see what others have done to adjust the depth of field. I also opened mine up and made sure there were solder pads on the + and - terminals of the battery. I put 3.7V on it and it doesn't turn on. I applied 5V from my DC power supply and turned it on. 1.3 amps drawn to the maximum load. Inside there is enough room for a 3.7V battery with a 2A 5V boost converter. Design coming soon. It would be nice to carry the scope indoors or outdoors without being tied to an external 5V power supply (wall or external battery). I tried AD409, AD208 and AD407. AD407 gave me the best picture and video. The AD407 had the lowest shutter lag, video blur effect when moving the board quickly. I'll leave the AD407 despite its depth of field issue. But I will look for newer models that will hopefully solve this problem.