Im just sorting through the process of buying my first arca-swiss style ballhead.

Im having a little trouble understanding the need for different thicknesses of lens plates/rails and the variation in clamp sizes.
I get the different plate/rail length requirements but why clamp size and thickness variations.

One site Im looking at with these offerings is Hejnar Photo. http://www.hejnarphotostore.com/inde...ort=20a&page=1
This was recommended to me by I@M as a source for quality plates that dont charge through the nose prices

Thanks for your patience and help

David