I will soon post some explanations to this topic.
I use a normal DSLR with a so called retro adapter to mount the lens reversed.
In between I add some extension bellows.
Than with a little bit of practice and some learning how to do it best you get really nice Pictures.
![Cool 8)](https://www.eevblog.com/forum/Smileys/default/xcool.gif.pagespeed.ic.cOxV6sPNRd.png)
Magnification should be around 20.
The sensor is 2,3cm wide and I can zoom in to a width of a little more than 1,1mm.
More magnification ist possible but you don´t get more details. I think you can´t do better with such kind of tool.
But the picture has 18 Megapixel! The theorethical resolution is 0,4µm.
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/xgrin.gif.pagespeed.ic.QVVz6XIT20.png)
According to my experience the actual resolution limit is around 5µm. On a good day and with a little bit of interpolation perhaps 3µm or 2µm.
More to this topic coming soon...
![Popcorn :popcorn:](https://www.eevblog.com/forum/Smileys/default/EatingPopcorn.jpg.pagespeed.ce.yJ6TmC5fSa.jpg)