ND-Filter Holding for Walimex Fisheye

This Filter Holder can hold a welding glass (110 x 90 mm) and attatch it to a Walimex Fisheye Lens. This is the best way to make longterm exposures with a Walimex Fisheye.
I have mounted it on my 8.5 mm Fisheye, and the results are amazing. you can check out some pics on my blog:
http://raphaelsperl.wordpress.com/