Saw that Cokin now make M-Pro 4x4 and 4x5.6 filters, and at a very competitive price (about 30 dollars per 4x4).
Has anyone used these and can share his/her experiences with them?
(Apologies if this has been answered before; I did a search on reduser, that yielded 0 hits. Tried again with the help of google, and there I only found and one about using the IR filter from Cokin.) threads dealing with light weight filter holders