Astronomy Focuser

2-inch M48 Double Fine-tuning Focusing Base for Astronomical Telescope

Name: 2-inch M48 Double Fine-tuning Focusing Base for Astronomical Telescope
Brand: AMADA Microscope

The 2-inch M48 double fine-tuning focusing base is designed for astrophotography use on refracting, Newtonian reflecting, and Schkar astronomical telescopes.

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2-inch M48 Double Fine-tuning Focusing Base for Astronomical Telescope

Product Overview

The 2-inch M48 double fine-tuning focusing base is designed for astrophotography use on refracting, Newtonian reflecting, and Schkar astronomical telescopes. It provides 39mm of continuous spiral travel with a focus accuracy of approximately 0.1mm, enabling precise focus adjustment for imaging. The base features M48 external threads to directly connect a camera, and is compatible with any 2-inch focus mount system.

Focusing travel39mm
Focus accuracyApproximately 0.1mm
Thread sizeM48 external
Mount type2-inch focus mount
Motion typeSpiral
CompatibilityRefracting, Newtonian reflecting, Schkar telescopes

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Key Benefits

39mm of continuous spiral travel allows fine focus adjustments over a wide range
Focus accuracy of approximately 0.1mm improves image sharpness in astrophotography
M48 external threads enable direct camera mounting without additional adapters
Smooth spiral motion ensures consistent and repeatable focus positioning
Compatible with 2-inch focus mounts on refracting, Newtonian, and Schkar telescopes

Application Scenarios

Precise focus adjustment during long-exposure astrophotography of stars and nebulae
Fine-tuning focus when switching between different camera sensors or filters
Stable focusing during imaging sessions with varying atmospheric conditions
Mounting a camera directly to the telescope without intermediate adapters
Using the base on a Newtonian telescope where mechanical stability is critical

Who It Is For

Amateur and educational astronomy dealers doing astrophotography
University and school observatories conducting imaging projects
Research labs using small to medium-sized telescopes for observational work
Hobbyists building or upgrading telescope imaging systems
Telescope integrators assembling custom imaging setups

Problems It Solves

A fixed focus mount limits the ability to fine-tune focus during long exposures
Lack of fine adjustment leads to blurred images when using sensitive CCD or CMOS sensors
Need for multiple adapters between camera and focuser increases mechanical play
Inconsistent focus movement from non-spiral or coarse-threaded focusers
Incompatibility between camera thread size and focuser mount on older telescope systems

Technical Features

Spiral focus mount with continuous 39mm travel for precise adjustment
Focus accuracy of approximately 0.1mm for high-resolution imaging
M48 external threads for direct camera connection
Designed for 2-inch focus mount systems
Smooth, continuous motion suitable for long exposure imaging
Compatible with refracting, Newtonian reflecting, and Schkar telescopes

Specifications

Focusing travel	39mm
Focus accuracy	Approximately 0.1mm
Thread size	M48 external
Mount type	2-inch focus mount
Motion type	Spiral
Compatibility	Refracting, Newtonian reflecting, Schkar telescopes
Interface	M48 to camera or adapter

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

Comparison With Other Options

Standard 2-inch focus mount without fine-tuning	The double fine-tuning base provides 39mm of continuous spiral travel with 0.1mm accuracy, while a standard mount offers limited or coarse adjustment, reducing image sharpness in astrophotography.
Single-axis focusing base	The double fine-tuning design allows for more stable and repeatable focus positioning compared to single-axis systems, reducing mechanical drift during long exposures.
C-Mount to M48 adapter	The M48 thread on the base eliminates the need for an adapter, reducing mechanical play and alignment issues when connecting a camera directly.

Use Guide

Ensure the telescope's 2-inch focus mount is clean and free of debris before mounting
Attach the focusing base by aligning the M48 thread with the camera or adapter
Use the spiral motion to adjust focus slowly and precisely during imaging
Avoid sudden movements to prevent misalignment or mechanical stress
Check focus accuracy periodically during long sessions, especially in changing temperature conditions