There's a few 5:1 dedicated macro lenses. Around 2:1 and above though, handholding becomes near impossible and you almost always need focus stacking due to the

There's a few 5:1 dedicated macro lenses. Around 2:1 and above though, handholding becomes near impossible and you almost always need focus stacking due to the very shallow depth of field. Not to mention powerful lights. So even this "conventional" option that you can readily buy is quite the niche. For a 0.2mm subject, 5:1 is not enough. Luckily, one can use a microscope objective on a camera, like this: https://c7.staticflickr.com/1/411/31944206126_fee397795a_b.jpg https://c7.staticflickr.com/1/411/31944206126_fee397795a_b.j... It doesn't have to be a bellow, they can also be a fixed tube, but the idea here is that the camera's sensor is at a specific distance to the back opening of the microscope objective. It would be the same distance where normally the eye piece of the microscope goes. This way, you can do 10:1, 20:1, 50:1, 100:1. You'll have ever greater problems though the more you magnify (vibration, light, composition). The device in the bottom is an automated focus rail, a WeMacro in this case. You set a start point and end point, and it takes all photos in between. It can move by as little as 1 micron and is quite cheap.