Summary: Outstanding "telescopic" performance! Just barely made it eye relief wise with my thin glasses. Like the other Fujinon FMT-SXs , can be used w/o glasses with my 4.25 diopter prescription, and probably could be pushed to 5.Must be tripod bound. Again, like the others, these have individual focus and are completely water tight, great in dewey areas. Really great job on nebula..