131mm DIY Astronomical Telescope Objective Lens Full Metal Holder Tube Length 108mm

131mm metal objective lens holder for astronomical telescope
The objective lens holder is made of alumin um alloy.
It is composed of the objective lens holder and the lens pressure ring.
108mm total length, Lengthened type (no need to equip with hood),
The internal matte treatment, the surface is oxidized black.
Suitable for metal pipes with 139.7mm outer diameter and 133.7mm inner diameter.
Package : 1set of the lens holder