Threads fit directly onto the back the the ZS61 scope. Really like the adjustable tube body which allows for backfocus of the imaging train without multiple small extensions or spacers.
Amazing. Fits perfect and does what it says. Just be sure to make 12.0mm of space for DLSR cameras and you are good to go, flat field. OPT customer service and quality of shipping is top notch as usual
Jake was very helpful in helping me select this item