Hello Matthias,
Here are the instruction manuals again – there might be a bit more information in them...
Wallner Manuals
The spot metering method – at least the way I’ve used it – is actually quite simple. You choose an area that appears in as many negatives as possible, e.g. sky, skin tones, etc., and use test strips to determine the correct exposure time and aperture combination. Then you position the measuring probe exactly on that spot, select one of the four channels, press the measurement button on the main unit and adjust the corresponding potentiometer until the previously determined time is shown on the display. After that, you simply need to measure similar areas on the negative and you’ll usually end up with a pretty usable positive. Once you’ve had some practice, you’ll always find the optimal measurement point quite quickly, or adjust the measured time to your liking, for example to get a bit more detail in the clouds.
Alternatively, you could also assign a zone of your choice to each of the four memory slots – then the corresponding zone in the positive will have exactly the selected density...
If you measure the brightest and darkest areas in the negative, you’ll also have a good indication of the necessary gradient.
Although the Wallner boxes are all quite a few years old, you can still achieve good results with them quite easily.
