third time seven sisters

I have to confess to checking my intuition. I read a collimation guide and wish I hadn't. How folk can complicate a simple 3 step process to such extents is beyond me. So here we go. My third go at m45, this time two minutes Oh and I turned the camera through 90º.. Hey, dust!
cluster m45 the pleiades in taurus
canon 700d + bresser nt150s   29x120s @ ISO800