I always wanted to buy amazing GND filters, but until now I only got my 10 stops B+W filter and a B+W polarizer.
Since I'm working on a time-lapse landscape project I realized I need some filters to get exactly want I want.
Studying the whole stuff I came with these options: Lee filters of Hitech filters (slightly cheaper but with a very good quality as well) and the size
should be 100mm.x 150mm.
Alex, I'm interested as to what application has you looking at GND? I've always found that I can use ND as required to lengthen exposure, and make local adjustment in post, or bracket and combine in post. I guess if you need both ND and need to keep exposures truly back-to-back, that might be one application.
Graduated Neutral Density filters. Lee 100 x 150 is the prime choice but at high price, Hitech have a good reputation but varied reports on colouration, it depends on your eye (some see it some don't). I've got the Hitech holder with the 77mm adapter for my 80-200 & 24-70 but waiting for someone to buy me a birthday present - Lee filter grad set .3, .6, .9 & the big stopper. The 150mm gives you a lot more scope, you tend to run out of room with the 100x100. The holders are really not a game changer between the Hitech and the Lee. If you want good resale, take the Lee, but the number of buyers is less. Usually when you are shooting with these things you have to take your time, so I don't need the holder over engineered to get the same result. Hope that helps.
What John said is very close to what I had found on several sites: Lee are better but not of a wide margin. So this confirms my doubts and i can reconsider Hitech an interesting option :)
As for the use I'm going to do with filters: time-lapse videos are built with still images (every video is, but when you shoot a video you don't take every single image) so most of the rules that we apply to landcsape photography can be same - as Paul said about bright skies exposure. What time-lapse sometimes requires is a longer exposure because too fast shutter speed can generate some kind of issues, so I'd need of a ND filter too, since my 10 stop B+W can be rather 'extreme'.
I feel I need to buy them for two reasons (a part from the simple fact of improving my photography): my time-lapse project is becoming much more important than I had thought at the beginning - it will be presented during a big event in September and I'm super excited about it. Moreover some people are asking me landscape workshops and in my view, even if my landscapes are already appreciated, a good teacher should use properly ND and GND filters.
