Non-cropped (but JPEG-downscaled) macro photo of a matchstick head, created with a macro lens Tamron SP AF 90 mm F/2.8 Di MACRO 1:1 and a wide angle lens smc Pentax-M 28 mm F/2.8 mounted in "reverse position". This combination (see photo link below) allows a magnification of 3.2:1 – but only with a tiny depth of field at a working distance of approx 4 cm. The sharpness/quality of the image is not really convincing. The shading of the corners is probably due to the fact that the reversed lens had a smaller filter diameter (49 mm) than the camera-mounted lens (55 mm). With an aperture of f3.5 in the macro and f22 in the reversed lens, the vignetting was the lowest (and the depth of field was the best; as shown here).
<a href="//commons.wikimedia.org/wiki/User:Fice" title="User:Fice">Christian Fischer</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>