small price that makes me make big savings

I have several goals at no 49, 52, 67 and 77.
I had only one solution was to buy as many filter format (such as neutral density filter MC Pro II ND 1000 or 400) that I had no different purpose. But it multiplies the financial outputs to acquire them.

I discovered these Russian dolls and I confess that I just mount it on my most small goal and it works perfectly. In addition, they are thin and therefore, all nested within each other with the objectives cache the larger format, I can possible thicknesses 7 + filter itself (purchased 77 mm) = 3.3 cm high, which is not considerable.

For this small price, I made a saving of 2 filters (neutral ND 400 and 1000) multiplied by 4 screw = 8 times 50 euro approximately. !!!
So I recommend to buy: 20/20 because they are "solid)

NB: after using the 8/10/2013, be careful, do not force it by turning the rings into each other, including filters, as I struggled to unscrew some. Do not block especially, as they are not thick, you will not catch and more, you may break your filter.