I have used catseyecollimation tools for a while with a white reflective triangle center mark that my mirror came with (16" f\4.375) and I was able to see the reflections in the autocollimator just fine. I recently replaced the triangle mark with the yellow hot spot and I can tell that viewing and identifying all the reflections is now mission impossible at night. I always use the clipon red light that catseye sells to do nighttime collimation but my last two attempts were unsuccessful with the new center mark. I ended up collimating with the TELETUBE XLS SIGHT TUBE only. I wonder if someone has any tips to overcome this issue. It might be possible that I just need to get used to it again.