J004 2" 1.25" Universal Astronomical Telescope Focusing Mount

Key Benefits

• 70mm focusing stroke allows full adjustment for eyepieces of different focal lengths and telescope tube lengths
• 2-inch eyepiece interface with 1.25-inch convertible adapter supports both standard and compact eyepieces
• φ84.5mm dovetail host interface ensures compatibility with a wide range of telescope mounting systems
• All-metal build resists flex and maintains alignment under repeated use
• Manual focusing method gives direct control without electronic components or power requirements

Application Scenarios

• Adjusting focus on a Newtonian telescope with a 2-inch eyepiece for planetary or deep-sky observation
• Switching between 2-inch and 1.25-inch eyepieces during a single observing session without changing hardware
• Mounting on a telescope with a φ84.5mm dovetail saddle for stable, vibration-free focus adjustment
• Using in a portable setup where mechanical reliability and simplicity are preferred over electronic focusers
• Supporting a wide range of eyepiece types in an amateur astronomy club's shared telescope fleet

Who It Is For

• Amateur astronomers using Newtonian or reflector telescopes
• Astronomy clubs managing shared equipment with mixed eyepiece standards
• Educational institutions teaching observational astronomy with diverse telescope setups
• Field observers who need a lightweight, reliable focusing solution without batteries or wiring
• Hobbyists building or modifying telescope systems with standard dovetail mounts

Problems It Solves

• A fixed focus mount prevents adjustment when changing eyepieces with different focal lengths
• Lack of 1.25-inch compatibility limits use of smaller, common eyepieces on a 2-inch mount
• Plastic or low-strength focusers can flex under weight, causing focus drift during observation
• Incompatible host interfaces prevent mounting on existing telescope saddles or tripods
• Electronic focusers require power and are not suitable for long-duration or remote field use

Technical Features

• Manual focusing method with smooth, consistent motion across the full 70mm stroke
• 2-inch eyepiece interface with built-in 1.25-inch adapter for interchangeable eyepiece use
• φ84.5mm dovetail host interface for secure mounting on standard telescope saddles
• All-metal construction for durability and resistance to thermal expansion and mechanical stress
• Focusing stroke range of 0 to 70mm allows full adjustment from minimum to maximum focus position

Specifications

Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.

Customization Options

• Option to supply without the 1.25-inch adapter if only 2-inch use is required
• Custom finish or coating available on request for corrosion resistance or aesthetic preference
• Alternative host interface sizes available upon request for non-standard telescope mounts

Comparison With Other Options

Use Guide

• Ensure the φ84.5mm dovetail is securely fastened to the telescope saddle before use
• Insert the eyepiece into the 2-inch socket and verify the 1.25-inch adapter is properly seated if needed
• Adjust the focus by turning the manual knob slowly; avoid sudden movements to prevent overtravel
• Check for smooth motion across the full 70mm stroke; if binding occurs, inspect for debris or misalignment
• Use the 1.25-inch adapter only when using a 1.25-inch eyepiece; remove it when using 2-inch eyepieces to avoid interference