Schneider 120/5.6 0058 Makro Symmar on GFX 100S at 1:1

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JimKasson
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Schneider 120/5.6 0058 Makro Symmar on GFX 100S at 1:1
1

We have a winner! At least so far.

The vertical axis is MTF50 in cycles per picture height. Higher is sharper. The horizontal axis is f-stop.

  1. The blue and red columns are for the Schneider lens on axis, with, respectively, a horizontal and a vertical edge.
  2. The yellow and purple columns are for the Fuji 120/4 macro lens on axis, with, respectively, a horizontal and a vertical edge.
  3. The green and light blue columns are for the Schneider lens on the right side of the 33×44 mm frame, with, respectively, a horizontal and a vertical edge.
  4. The brick red and blue columns are for the Fuji 120/4 macro lens on the right side of the 33×44 mm frame, with, respectively, a horizontal and a vertical edge.

At its optimum aperture of f/5.6, the Makro Symmar is about as sharp in the center as the Fuji lens, and far sharper at the edge. In fact, it is virtually as sharp at the edge as in the center.

A word about the f-stops. I’ve plotted the indicated f-stops, not the effective ones. The Fuji lens used internal focusing, which means that the focal length gets shorter as you focus closer. That in turn means that the effective f-stop doesn’t narrow down as fast as it does with a lens like the Schneider Kreuznach that maintains its focal length as you focus closer. That explains the Fuji’s apparent better performance at the narrower f-stops.

I think this lens would be perfectly suitable for 1:1 flat field copy work on the GFX. It's not expensive, but you do need to adapt it to the camera yourself.

Details, lots more graphs here:

https://blog.kasson.com/gfx-50s/schneider-120-5-6-0058-makro-symmar-on-gfx-100s-at-11/

There have been people on this forum who said that you couldn't do better at 1:1 than the GF 120/4 and a 45mm tube. This test refutes that assertion quite conclusively.

Jim

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