Lee Filters - resin/pro glass/polyester

[FreeloaderJoe]

What does everyone think is the difference between the above filters in the real world. Want some ND grads particularly to use filming HD on the 7D.

I'm a hobbyest who tends to take his camera gear on bikes/boats/long travel expeditions

 

[George]

Joe, have a look on the Lee web site.
The resin filters are what you want for NDs, I suggest 0.6 and 0.9 hard are probably the most useful. The polariser will be glass, and you need a circular polariser (that's the type, not the shape although it is circular in shape) as this is the only one which will allow your af system to work.

They have an excellent book called "Inspiring Professionals" which is a Tenner well spent and explains a lot.
http://www.leefilters.com/camera/products/range/ref:I46C9C1B6AA3DD/
and subsequent pages will help you I hope.
George.