This weekend I scanned a rather un-artistic shot where I wished to illustrate (for this thread) the level of optical correction of the 140 Macro. I have earlier-on shown the good performance at infinity, here it is at the opposite end of the spectrum: Around 2:1 magnification (I think, but it's more than 1.5:1 in anyway) by stacking two 82mm extension tubes, and adjusting the lens' floating element to minimum focusing distance. This is slightly outside the intended usage range of this lens (which end at a No.1 + No.2 tube, not two No.2 tubes).
A close-up of mould (fungus, no idea which type) growing on a Papaya fruit (natural lighting, this was a long exposure):
Now this image is limited by three factors, I imagine:
- A *very* heavy and unwieldy camera combination on a poor (1950s) tripod. Mirror-lockup seems to have done the trick though, the leaf-shutter is marvelously vibration-free for this sort of work.
- As ever, a non-professional scanner with flimsy plastic film-holders.
- Shallow DOF, yet also some diffraction by shooting at f/22 to get as much DOF as possible. Shooting at f/32 or smaller would have made it even softer.
I have extensive experience with Macro lenses from Olympus and Canon, and (aided by the 6x7cm format being 'easier' on lenses for resolving power, no doubt) none of those systems have a single Macro lens that can do infinity to 2:1 this well. Of course, none of those systems have a Macro lens as darned difficult to use as this one!