Baader DT-4 extension sleeve 31.8 mm
For eyepiece sockets (18mm length). An off-axis systems or folding mirrors approaches often, the problem is that the receptacles of the normal eyepieces just 1-2cm are too short to adjust the sharpness level properly.
This extension sleeve has on both sides of the filter thread 1¼ inch eyepieces and can be (almost) every 1¼ before" Screw the eyepiece. Several 1¼ inch sleeves are combined.
The inside diameter is prepared to accommodate the lenses of our Glasspath corrector 1: 1.25 and 1: 1.7