Time to invest in a decent variable ND for my Canon 24-70 mk2. Not sure which brand to go with
Singh ray
http://www.singh-ray.com/varind.html
http://www.bhphotovideo.com/c/product/706712-REG/Singh_Ray_R_87_82mm_Vari_ND_Variable_Neutral.html
Light craft
http://www.bhphotovideo.com/c/product/742538-REG/Light_Craft_322_82mm_Fader_ND_Mark.html
or heliopan
http://www.bhphotovideo.com/c/product/829300-REG/Heliopan_708290_82mm_Variable_Gray_ND.html
Singh ray
http://www.singh-ray.com/varind.html
http://www.bhphotovideo.com/c/product/706712-REG/Singh_Ray_R_87_82mm_Vari_ND_Variable_Neutral.html
Light craft
http://www.bhphotovideo.com/c/product/742538-REG/Light_Craft_322_82mm_Fader_ND_Mark.html
or heliopan
http://www.bhphotovideo.com/c/product/829300-REG/Heliopan_708290_82mm_Variable_Gray_ND.html