Ken, You might want to crank up the interpolation precision a bit. I've not had problems quite this bad but similiar. I have found that the filter sharpness and interpolation precision can have a big impact. You might want to also up you photon count a bit. As for the previous post, I have found that full raytracing is in fact NOT required if you're doing HDRI only and there are no lights! I'm finding myself becoming very lazy in my lighting because HDRI can produce some very nice reflection and lighting effects. As most of my images have been boring green product shots I do a quick low res render to check the ligting intensity and then leaving it rendering over night with all the settings high. There are some nice HDRIs on the C3 disk 2 that work well. I'm hoping to have time over Xmas to learn how to create my own HDRIs which at this time of year in Calgary will have a lot of snow in them. Andrew *<:=