Yes, precisely. Another of my followups to this thread says basically the same thing. I'm curious why there isn't something like this already being made, with all the millions of Chinese knockoffs for all sorts of obtuse stuff, but nothing like this. Perhaps it really is rather specialized. Although, it might also make round screw-in ND grads useful, since a standard screw-in ND grad forces you to have the horizon dead center. If you could use the sliding bord that I am proposing, you could move the grad line on these sorts of filters, and make them much more useful. Of course, the filter would have to be much larger than the lens to make them useful in this fashion. Andrew On Tue, January 29, 2013 6:41 pm, James Schenken wrote: > Andrew > > > What you are describing is a traditional lens board with a threaded hole > in the center. The easiest way is to use a sacrificial Cokin filter with a > carefully centered hole and a filter ring cemented into place. > > Of course, any suitable piece of material would do if the thickness was > correct and the size the same. > > > > On Jan 28, 2013, at 11:59 PM, asharpe@xxxxxxxxxxxxxxxx wrote: > > >> Hi folks, >> >> >> I wonder if anyone has ever invented a slide-in adapter for the cokin >> series that had threads for traditional filters? >> >> I know that that problem is exactly what the filter system is trying to >> solve, not needing separate sizes of filter for multiple lenses, but >> the fact is, sometimes (usually?) traditional filters are of much better >> quality than the cokin filters. Specifically, I'm thinking about the >> cokin polarizers, which are unimpressive. I already have some very good >> screw-in polarizers, but I'd like to use the cokin system for my ND >> grads, and a screw-in polarizer on the lens with the cokin system in >> front of it is clumsy at best, unusable at worst. >> >> It seems that a simple slide in card with an appropriately-sized hole >> with threads would be very useful. So, does it exist? If not, perhaps I >> can convince folks with a kickstarter project. >> >> Andrew >> >> > >
