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There are a several makers of filter holders, but the one most people use is Lee. Buy the 100mm size since this is the most common size used for rectangular GND's (4x6 inches or 100x150mm) Most of my GNDs are Singh Ray, though I also have a few from Lee. In terms of quality, both are roughly the same, though Lee slightly cheaper. Lee is also known to have legendary supply issues that can have you waiting weeks, or even months, for your order. Lee filter holders use a separate screw-on mount that's sized for your lens' filter size, so if you're intending to use both 77 and 82mm sizes, you'll need one for each size. Both Lee and Singh Ray also make ND filters of varying strengths. In that regard, you've probably heard of Lee's "Big Stopper," which is quite popular here. The Big Stopper does add a significant blue cast, but this is correctable in post processing. Don't know whether this occurs with the Singh Ray equivalent, but it's expense tends to keep me in the Lee camp.
Variable ND filters have been around now for a few years, but I've never been tempted to try one. Depending on the brand they tend to be eye-wateringly expensive, and there's also the complaint that there's significant vignetting. Since you're also playing with essentially two polarizers, there's also the risk of adding some unnatural coloration to your skies at wide focal lengths under 20mm. Personally, I want either a lot of stopping power or none at all, so I've not found much use for medium stopping strengths. But then, that's just my opinion. If you do end up with a square ND like the Big Stopper, be aware that it is made of 4mm glass, and as such you'll need to purchase Lee's 4mm slots that go onto the holder for this item.
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