I believe he didn’t remove lp1 before I sent my camera to Andy at astrononmiser I asked him about the badder mod for the canon 6d he told me that he stoped doing that mod due to internal reflections causing red halo’s around stars he talked about since the advent of the canon 500d and there sensors are mounted by floating them on springs meaning there is a small amount of adjustment built into the design which is generally sufficient to adjust for the loss of filter glass meaning that the auto focus is sharp he also said that the badder filter blocks uv/ir light however the the front filter which remains in the camera already does this blocking 97 percent of uv and ir light so the extra layer of filtering isn’t required so it seems that he didn’t remove lp1