The system is constructed so that the adapter ring is threaded onto the lens. The ring has an external thread for the lens and an internal thread for the Haida Polarizer (more on that later). Laterally located around a groove in which engages the holder. The holder has a kind side screw that you press a pusher. This slide engages in the groove of the adapter ring. So you can very quickly assemble or disassemble the holder. Really very good .... but not quite well thought out. Unfortunately, it is these slides also lock not quite, so that he could MAY fall times. The system there is apparently also in Lee with the same problem. But well, you know it, is something to watch out and well.
The holder has assembled 2 bays and a third is. However, for it to separate screws, which also accompanied, are mounted. Is done in 2 minutes. However, you can see all 3 slots shadowing at 16mm (see image, right side 3 drawers, left only 2). At about 18mm but they are gone again.
Actually, a no-go, because I want to filter nutzden 3, but now comes the highlight of the whole :). So yes, I would like to use polarizing filters, normal ND filter and a graduated filter. Haida has since let think of something quite funny, but also has a small disadvantage. The Haida polarizing filter can be screwed directly into the adapter ring so that you need only 2 slots for the other two filters and therefore also has no shading. The disadvantage is that you can not so at all times comes to the polarizing filter to rotate it. it is necessary to disassemble the holder, set pole and bracket it again. BUT eigenltich that's not so wrong, because with a 3.0 ND I see neither through the viewfinder, even in LiveView something and must therefore anyway the filter pull out. So I can take off with a small handle the holder also equal to what is probably easier anyway. I'll remember in practice.
So summarized briefly times all points.
+ Holder is made of aluminum. Bays of quality plastic
+ No shadowing at 16mm to VF with 3 filters. Vorrausgesetzt, taking the Haida Polarizer
+ Price
o The system is good, but a little unsure. By not veriegelbaren slide could be the holder fall off times
o- polarizing filter is screwed directly into the adapter ring dadruch but you get no longer ran
- With 3 drawers mounted one has to shadowing 18mman VF, but normally you do not need all.
- Lens cap does not fit it.
One star deduction for the no longer reachable polarizing filter and the non-lockable slide.
I have this holder can not test in practice, because I am still waiting on my filter. Only the polarizing filter I have assembled. Once I have the filters and could even test, I'll keep you informed.