I just had to take some photos of some electronic components for a client and after I'd got the views they needed, I wanted to show the comparative size, so got a 5p coin out of my pocket (~18mm diam.)
I was tempted to use one of my recent experimental macro lenses, but the trusty Canon MP-E65 won out
A stack of ~70 50MP 5Ds images using a Stackshot motorised rail and Helicon Focus.
Flash: Canon MT-24EX with heads mounted on fixed flexible stalks
Note the slight discolouration of the top chip's metal surface from the spark engraving of the numbers.
One of the problems I have with photographing such components (apart from trying to stand them on their edges) is that dust settles out quite quickly. I normally reckon I've got a half hour or so working with any setup before a bit of dust will land somewhere inconvenient.
Another advantage of using my 5Ds for this is that large prints are no trouble.
The prints (32"x22") shown here are printed with Canon's PRO-2000 printer from my recent review (note the coin for scale).
The detailed photo shows the coin on top of a similar size print of the more detailed image.
The paper is a new heavy textured watercolour paper from Innova that I've been testing.
There is some more info in the PRO-2000 reviewhttp://www.northlight-images.co.uk/reviews/printer/review_canon_pro-2000.html
And some of the lenses that didn't make the cut for this job... http://www.northlight-images.co.uk/article_pages/telecentric_macro.html