I have one of these and used it extensively with a FLI Microline 16200.
It delivers a lovely wide view, easily covers a full frame sensor as it was designed to cover 60 x 45mm film and is easy to focus and it holds focus overnight.
https://pbase.com/gregbradley/image/170433412/large
https://pbase.com/gregbradley/image/169050011/large
Greg.