I made this quite a while ago, the drill press was a cheap attachment for a 1/4" drill.
macro by
aardvark_akubra, on Flickr
Distance from camera flange to lens flange is about 235mm, distance from front of lens to object is about 40mm.
Lens is Helios 44mm 2/58. Camera is Pentax ist*DS.
Coin 0.7sec at F16, almost impossible to focus at wider apertures!
Computer ram 0.3sec at F5.6.
The light is natural winter sunlight on a rather cloudy day and was fluctuating quite a bit.