98mm RD-EXT 20.1mm (TKA86596)

The threads on this extension are incredibly smooth—it screws onto my focuser without any binding. Fit and finish are exactly what I expected for a precision astrophotography part.

The extension tube threads on perfectly smooth, with zero play—critical for keeping my imaging train perfectly aligned. It's a simple piece, but the machining is clearly top-notch.

The 20.1mm spacing hits the mark perfectly for my reducer setup, and the machining is so precise it threads on smooth with zero play. Took a few minutes to dial in, but the star shapes across the whole frame are noticeably tighter now.