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I use a Victor by Dunlop. They are tension adjustable and radius adjustable. THey are the best, imho. IF the radius doesn't match the board, then by the time you get the capo down on all strings, some strings have too much tension and go sharp. When you get the radius correct and the tension correct, it is like playing with proper technique....things play in tune....as well as any guitar can since these are imperfect instruments at best, right?
Koen, if you want to see if your capoand fretboard have a radius mismatch..or match...do this experiment. Place the cap in position and slowly tighten that tension nut on the SHubb whiel gently picking across the strings. IF some strings are 'fretted' before others, then the radii of the two variables is mismatched. IF the outside strings 'come' before the inside, the cap's radius is shorter than the fretboard. IF the inside strings 'come' first, then the radius of the capo is flat relative to the 'board. Which ever strings come to the fret first will be sharp by the time enough tension is applied to bring the other strings to the fret.
I liek the Shubb in that it is tension adjustable. However, if the radius is mismatched, it does not offer any adjustment. The Victor is made of brass and can be radiused to match any fretboard.
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