Antares' 1.25" Extension Tube # ET1 adds 56.5mm (2.22") of back-focus travel to your telescope focuser. It fits standard 1.25" eyepiece tubes in telescopes and accessories like diagonals. With this, eyepieces and accessories that you may not have been able to use because your focuser tube was too short are usable again The adapter is precision machined from aluminum and black anodized, and threaded to accept standard 1.25" astronomy filters.
- Total Length = 3.35" (85mm)
- Outside Length of Upper 1.25" Barrel = 2.22" (56.5mm)
- Length of Lower 1.25" Barrel = 1.12" (28.5mm)
- Thread Specification (Telescope End) = M28.5x0.6 Female
- Made in Canada