Just some quick work to show how an inverted 35mm lens works as a macro lens. I'm not convinced that this approach to macro filming is useful in practice, and this video is pretty low quality because the footage is shaky and the depth of field so marginal. Even when you film a flat surface nearly straight from the front you still see huge blur for parts slightly further away.
Following a suggestion from Lucasberg (user277672) , I reversed my 35mm camera lens and put it in front of my HV20 with some sticky tape.
Then I filmed my finger, some letters in the newspaper and a tiny spider.
The magnification is amazing, but the depth of field is just as small as the magnification is large...
Estimated focus distance is about 4 cm, and the depth of field about 0.2mm