Helge Mortensen wrote in post #6052851
I am a little confused here!
Wouldn't a glass filter be easier to break?
And a plexiglass or whatever they use just get scratches?
Lee and Hitech GND filters are made from the same grade and type of resin material, the major difference being that the Lees are 4x6 while the Hitechs are 4x5. The Lees are also the slightest bit thicker than the Hitechs, but I don't have any problems using my Hitechs in the Lee holder. I also believe the Singh Ray filters are also made from resin. The only glass GND's that I'm aware of are made by Tiffen, IIRC.
The resin filters are pretty forgiving in that they do not break easily. Like any other filter, they can scratch. Minor scratches will not have any effect on image quality. I've dropped a few here and there in the darkness over time and have yet to have one break. Be careful with them, handle them by the edges, and they should last you quite a while.
The Hitech filters are a good choice...excellent filter, moderately priced. I doubt very much that anyone can tell the difference between images taken with a Hitech, Lee, or SR filter.