Retrofit Your Meade ETX-125, ETX-105, or ETX-90 Telescope

Create custom telescope solutions by replacing the black plastic back on your ETX telescope with your own creations.

These black hard anodized aluminum adapters were designed for the Meade ETX-125, ETX-105, and most ETX-90 optical tube assemblies manufactured prior to the Meade ETX Observer Series released in 2017.

• The ETX-125 OTA Adapter is threaded for 2 inch Schmidt-Cassegrain telescope accessories
• The ETX-105 OTA Adapter is threaded for 2 inch Schmidt-Cassegrain telescope accessories
• The ETX-90 OTA Adapter is threaded for standard 1.37 inch (34.6 mm) ETX telescope accessories

Installing a Wegat Optical Adapter

Steps for Removing the Black Plastic ETX Back

1. Remove the focus knob from the focus shaft. Requires a 0.05″ or 1.27 mm hex wrench
2. Separate the optical tube from the fork mount (if still attached).
3. Using a 7/64″ hex wrench, remove the three hex screws that secure the black plastic back to the tube (two are deeply recessed).
4. Slide the black plastic rear cell / back off the tube.
5. Seat the Wegat Optical adapter and fasten it with the kit screws. Access hole plugs come pre-installed in the adapter.
6. Cap the threaded port with the included end cap when not using accessories.

Mounting the OTA

After the fork comes off, the tube is usually held in rings. Exact-fit rings are uncommon, and the Gallery shows what people have used.

Discussed online:

• Tube rings for an ETX125? (Cloudy Nights)
• Wegat backs for ETX-105s (Cloudy Nights)
• Wegat Optical back on an ETX-105 (Cloudy Nights)
• The single best mod — ETX-125 (Cloudy Nights)
• ETX-90 Wegat conversion (Cloudy Nights)
• @WegatOptical on X

See the adapters in use: