Name
1.25"-34mm Telescope Eyepiece Extension Tube
1.25"-40mm Telescope Eyepiece Extension Tube
Total Length
2.20" (56mm)
2.75" (70mm)
Outside Length of Upper 1.25" Barrel
1.33" (34mm)
1.57" (40mm)
Inside Length of Upper 1.25" Barrel
1.33" (34mm)
1.57" (40mm)
Length of Lower 1.25" Barrel
0.86" (22mm)
1.18" (30mm)
Maximum Outer Diameter (Excluding Thumbscrew)
1.53" (39mm)
Thread Specification (Telescope End)
M28.6x0.6mm Female Threads
Additional Information:
* If the inserted eyepiece does not fully slide into the upper 1.25" barrel, additional in-focus travel will be required by the amount the eyepiece extends out
1.25" Telescope Eyepiece Extension Tube -34mm
Adds 34mm (1.33") of back-focus travel to your telescope focuser
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 telescope tube was too short are usable again
Precision machined from aluminum and black anodized
Threaded to accept standard 1.25" astronomy filters
Features a brass compression ring so the inserted accessory will not be scratched or dented by the locking thumbscrew
Total Length = 2.20" (56mm)
Outside Length of Upper 1.25" Barrel = 1.33" (34mm)
Inside Length of Upper 1.25" Barrel = 1.33" (34mm)
Length of Lower 1.25" Barrel = 0.86" (22mm)
Maximum Outer Diameter (Excluding Thumbscrew) = 1.53" (39mm)
Thread Specification (Telescope End) = M28.6x0.6 Female
1.25" Telescope Eyepiece Extension Tube -40mm
Adds 40mm (1.57") of back-focus travel to your telescope focuser
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 telescope tube was too short are usable again
Precision machined from aluminum and black anodized
Threaded to accept standard 1.25" astronomy filters
Features a brass compression ring so the inserted accessory will not be scratched or dented by the locking thumbscrew
Total Length = 2.75" (70mm)
Outside Length of Upper 1.25" Barrel = 1.57" (40mm)
Inside Length of Upper 1.25" Barrel = 1.57" (40mm)
Length of Lower 1.25" Barrel = 1.18" (30mm)
Maximum Outer Diameter (Excluding Thumbscrew) = 1.53" (39mm)
Thread Specification (Telescope End) = M28.6x0.6 Female
Additional Information:
* If the inserted eyepiece does not fully slide into the upper 1.25" barrel, additional in-focus travel will be required by the amount the eyepiece extends out
Package Include:
1 x Extension Tube