a ND must have when you really into a slow shutter or long exposure photography which give you 10 stops down …and easily create silky, motion of flowing objects e.g. water, wave, clouds …
*** further details and spec can view @
https://www.schneideroptics.com/ecommerce/CatalogItemDetail.aspx?CID=679&IID=3263
short sharing @ Long Exposures Gear – Big stop ND
And this is In-Stock now (24 March 2011)
contact me for further details here