In that pic was the Nisi 10 stop and a Lee 2 stop GND Hard. The GND isn't mine and goes back Monday, a colleague of mine loaned me it along with some others. I do have a reverse GND 4 stop filter on order though, from Nisi. The reverse GND made more sense to me to get first, given than 90% of my photography is at sunset right now
Never looked properly into the format hitech. It seemed to me most directions pointed toward LEE or Nisi and everyone compared those 2.
What's your next filter purchase? For me once I have the reverse GND I definitely want a normal GND. I might start building a collection of 2 stop, soft, medium & hard. Unfortunately, there is no "one" filter which does it all...thank god my wife just accepts this