I've seen a few little tidbits online where people don't even bother with filter holders and just hold them or 'dance' them in front of the lens during an exposure. I remember one video where Joe McNally was giving a workshop and a student was fumbling with the filter holder...he came up and shook it out of her hand and just 'forget about that..just do this' and just held it in front of the lens.
So, what's the verdict? Total pain in the butt or something worth having? I guess for LONG (2+ minute exposures) the filter holder would be worth it, but I usually wouldn't use filters in that situation anyway (night shots, etc)





