I ordered two Hoya IR filters (a 77mm and a 58mm) last week from B&H. The first shot produced with my new IR filters.
15 second exposure, ISO 400, f/8. (77mm filter on 10-24mm Nikkor).
I took several shots to produce this particular shot as I was trying to figure out the right combination of settings that would make for a good image. I did get a bit of motion blur from the wind hitting the tree limbs as I was shooting longer exposures. (You just have to accept that wind is a fact of life in the Texas Panhandle). I tried a few more shots the following night and I learned that the filters require a fair amount of light in order to work at all. I tried a few shots on the East side of my house when the sun was setting. There just wasn't enough light regardless of what ISO or shutter speed that I used.
At this point, the filters have given me the ability to shoot true IR without having to convert one of my cameras to a dedicated IR platform. The drawbacks to using the filters vs a dedicated IR body are that I have to setup the focus and composition prior to installing the filter (as I cannot see through the filter using the viewfinder on the camera). My AF system will still focus through it, I found out, but I have no idea what it is that I am actually focusing on when the filter is in place if I don't set it up beforehand. If I decide that I am going to be using IR a lot, then I will probably opt for a dedicated body through LifePixel. (The cost for doing that is really not that bad). But for now, the filters are fantastic for what I am using them for. (That can always change).
I'll post more when I take some more shots.