nonaC 40mm f/2.8
It's been a while, so I thought it's time for another gear post.
This is a summarized version of a blog post I posted in Swedish a few days ago here ». If you want the full version, please learn Swedish or read the google translated version (which I actually find quite comprehensible).
The past season (2015) I've experimented with the automatic reversing adapter MK-C-UP from the Chinese manufacturer Meike. This gadget is depicted in the upper left corner of the image above. It consists of two parts connected with a coiled cord and makes it possible to maintain communication with a reverse mounted Canon lens.
Mounting a lens in reverse orientation is a classic trick to achieve macro magnification with non-macro optics. In the age of aperture rings and mechanical aperture control, this was just a matter of physically mounting the lens to the camera body. A very simple adapter, with bayonet mount in one end and a male filter thread in the other was sufficient do the trick since the mechanical aperture ring would let you stop down the lens weather it was mounted in reverse orientation or not. Nowadays most lenses communicate electronically with the camera body. And with this development we've lost the mechanical aperture control needed to easily able to set the aperture of a reverse-mounted lens.
The Meike MK-C-UP adapter solves this problem by providing a way to by-wire, electronically and seamlessly communicate with a reverse-mounted lens.
This is not a new invention: Novoflex has offered a similar adapter for years. But with MK-C-UP, Meike has made it affordable (≈ $60).
I've found this solution particularly useful in combination with the relatively cheap lens Canon 40 mm f/2.8 STM. For high magnification work, this combination rivals the more expensive Canon MP-E 65 mm f/2.8 at least in some respects. While not as flexible as the MP-E in terms of magnification ratio, this "nonaC 40/2,8" offers some very nice qualities in terms of portability and image quality.
In the second comment I'll add a collection of image examples.
And in the third comment I'll wrap things up with some thoughts and conclusions.