Good old Williams Optics Binoviewers
.Will be great with your dob as well. Really enjoying mine with my 14" f5.1 dob.Will use also with my 22" f5.36 dob when primary is coated. The supplied 20mm 66deg oculars are quite good. However I wanted more magnification for moon and planets so invested in a pair of GSO 15mm 1.25" Superviews (70deg FOV), these work really well
.I tried the GSO 15mm Plossls, but not so good
; found images difficult to merge,and field of view too narrow.