DIY USB soldering microscope
I've been looking for a good and cheap USB microscope for soldering. Many of the Chinese microscopes are quite bad when it comes to their image quality and working distance. So I decided to make one myself.
A USB webcam should work well as the sensor because they no messing with drivers or viewing programs. The Logitech C270 is inexpensive and and it has a 1280x920 resolution.
Some quick googling also shows that it doesn't have any fancy autofocus features that could cause some issues down the line. Estimation the input lag from various reviews on the Internet wasn't easy but it seemed to be tolerable.
The lens is arguably the most important part of the system because the defines the working distance and the amount of light that gets to the image sensor.
I stumbled upon a 50mm F1.4 lens from some CCTV Camera which seemed like it'll do the trick. 50mm doesn't sound like it's enough for a proper zoom but this is 50mm with a 2/3" image sensor.
If the sensor used is smaller then the effective focal length becomes greater.
The minimum focus distance is around 30cm using that setup. It's a bit too long but that can be changed by moving the sensor closer or further away from the lens.
The lens also has a few adjustments for aperture and focus so finding something usable shouldn't be that difficult. The lens also came with a threaded macro adapter so now there's also a complete lens mount for my camera casing.
The project isn’t completely finished yet but I can show you guys how far I got to now.