Filterdurchmessser of 77 cm is very small, just fits ...

Filterdurchmessser of 77 cm is very small, just fits on 72mm lens from Sigma. I do not know why the diameter does not fit on a 77 cm lens, is also not too bad, because you can keep the ExpoDisc 2.0 front of the lens.
Use is in English only and therefore a point deduction. According to BGB all instructions in Germany must be available in German. One can not expect that all understand perfect English (technical terms).
If you understand the principle, then the white balance works quickly about 30-60 seconds with a Canon EOS 700D.
The white balance is much better than the automatic white balance of the camera.
Who wants to avoid to sit hours on the computer and follow up with the photos that can invest 30 seconds the manual white balance, and the photos are perfect.
I'm very satisfied.
However, I would prefer to buy the larger model with 82mm diameter.
The ExpoDisc 2.0 does what it should and very neat, on the processing can not say anything negative.
I would recommend this product further, although it is expensive, saves me the useful little tool a lot of work on the PC.