So, I've recently invested in a 16-35 II. I'm looking to use an ND filter for long exposures, but I'm having trouble settling on one.
I've looked into the lee system, which is obviously awesome, but comes at a price -the big stopper is £99, the holders etc will run to about £120. Not a cheap option! The other Idea was a Hoya Vario ND in 82mm and then step down rings- even more expensive with the filter alone running to about £200.
I've just seen a NiSi filter on amazon. 10 stop coated filter in 82mm for £49.98.
I'm just wondering if this is a good buy- if anyone has experience with these filters or even this brand I'd be really grateful.
I can't address your question about the NiSi filter, but I did a lot of research on the Lee vs. other filter holders before I bought the Lee holder. I bought the Lee holder because it would easily take filters made by other brands. The other holders, by Hitech and Cokin, each had its strong points, but both had a number of reviewers report various issues with some filters from other brands, including the Big Stopper. I wasn't able to verify all of this, but I did not find these issues being reported for the Lee holder--it seemed to take just about any 4x4 or 4x6 filter. Hence my decision to go with the Lee holder and then get filters from whichever other company I chose. FWIW, I do think it is kind of ridiculous to have to pay almost $90 for a filter holder, which in essence is made of plastic (albeit high quality plastic) and some brass screws. But, I can't make one myself and the other holders weren't that much cheaper and, as I noted before, tended to have an issue that would make using other filters difficult to impossible.
As for availability, the Lee system can be difficult to get and I ordered my holder and Big Stopper from different firms (Amazon and B&H) because of this. (I was fortunate to be on the waiting list for the Big Stopper for only a short period of time.) Since then, another firm that sells all sorts of filters has come to my attention: http://www.2filter.com
2filter seems to generally have Lee filters in stock and at regular (not marked up) prices. I have not used this company yet, but plan to try them in the near future. I found out about this company through the posting of another forum member so perhaps that person or others not the forum could say something about them. The 2filter website says it does have international shipping, although you'd need to check with them on that.
Good shopping and let us know what you decide to do.