1.25 inch Plastic Focuser for 90mm Refractor Telescope

🔭 1.25-Inch Plastic Focuser for 90mm Refractor Telescope

Upgrade or replace the focuser on your 90mm refractor telescope with this lightweight, cost-effective 1.25-inch plastic rack-and-pinion focuser. Designed for beginner to intermediate telescope users, this focuser offers smooth focusing performance and compatibility with standard 1.25" eyepieces and accessories.

✅ Key Features:

• Focuser Type: Rack and pinion

• Eyepiece Compatibility: Accepts all standard 1.25" eyepieces, filters, and accessories

• Telescope Compatibility: Designed to fit most 90mm refractor optical tubes

• Material: Durable, lightweight ABS plastic with metal gear components

• Drawtube Travel: Approximately 50mm (2 inches) of precise travel for accurate focus

• Focuser Tube Inner Diameter: 1.25 inches

• External Threads (if any): Typically not threaded; friction-fit or thumbscrew-secured eyepieces

• Securing Mechanism: Single or dual metal thumbscrews to hold eyepieces firmly in place

• Weight: Approximately 150g (5.3 oz)

🛠️ Construction & Design:

This focuser is constructed from impact-resistant black ABS plastic, which keeps the weight low—ideal for lightweight tripod mounts and small refractors. Despite being made of plastic, the internal components use metal rack-and-pinion gearing to provide smooth and reliable focusing action.

The curved mounting base is designed to match the curvature of 90mm optical tubes, ensuring a snug fit with minimal modification. Mounting holes are pre-drilled and spaced to fit most standard 90mm OTA setups, although some adjustment may be required depending on your specific telescope brand.

🔩 Installation:

• May require minor drilling or alignment depending on the original focuser style

• Mounting screws typically not included

• Designed for DIY installation or telescope maintenance/repair projects

🧑🔧 Ideal For:

• Replacing damaged or worn-out focusers on 90mm refractor telescopes

• Building your own custom telescope tube

• Astronomy beginners and hobbyists looking for a budget-friendly solution

• Lightweight travel scopes

⚠️ Important Notes:

• This is an entry-level plastic focuser and may not be suitable for heavy eyepieces or astrophotography setups.

• Not recommended for use with 2" eyepieces or accessories.

• Check your telescope's OTA diameter and mounting hole pattern before purchasing to ensure compatibility.

📦 Package Includes:

• 1× 1.25-Inch Plastic Rack & Pinion Focuser

• 2× Eyepiece locking thumbscrews (pre-installed)