Is anyone using this combo for IR? I've found that with a Hoya R72 and the 35 f/2, it gives a green cast whenever there is a reflective surface. It really seems to be around where the sun is very strong. I've not had this issue with the 50mm f/1.8 as of yet, nor the 18-135mm. I'll post a shot later when I get the chance. Just really curious if this lens is just not good at this.