---
product_id: 72019776
title: "Telescope Helical Focuser, Double Helical Focuser with 0.05mm Scale and 10mm Focusing Stroke, High Precision Telescope Accessories Focuser 1.25 Inch for Astronomical Telescopes Guidescope"
brand: "astromania"
price: "2888520₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Astromania"
url: https://www.desertcart.vn/products/72019776-telescope-helical-focuser-double-helical-focuser-with-0-05mm-scale
store_origin: VN
region: Vietnam
---

# 0.05mm ultra-precise focus scale 10mm smooth focusing stroke Full metal double helical mechanism Telescope Helical Focuser, Double Helical Focuser with 0.05mm Scale and 10mm Focusing Stroke, High Precision Telescope Accessories Focuser 1.25 Inch for Astronomical Telescopes Guidescope

**Brand:** astromania
**Price:** 2888520₫
**Availability:** ✅ In Stock

## Summary

> 🔭 Elevate your astrophotography game with precision that’s out of this world!

## Quick Answers

- **What is this?** Telescope Helical Focuser, Double Helical Focuser with 0.05mm Scale and 10mm Focusing Stroke, High Precision Telescope Accessories Focuser 1.25 Inch for Astronomical Telescopes Guidescope by astromania
- **How much does it cost?** 2888520₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/72019776-telescope-helical-focuser-double-helical-focuser-with-0-05mm-scale)

## Best For

- astromania enthusiasts

## Why This Product

- Trusted astromania brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Full Metal Build:** Durable double helical design ensures smooth, wobble-free focusing even in challenging conditions.
- • **Universal Compatibility:** Seamlessly integrates with M31X0.5 and M42X0.75 threads plus 1.25" accessories for versatile telescope setups.
- • **Pinpoint Precision Focus:** Achieve micro-adjustments with 0.05mm accuracy for razor-sharp planetary and deep-sky imaging.
- • **User-Friendly Scale & Grip:** Graduated scale and anti-slip textured knob let you lock in perfect focus settings—even with gloves on.
- • **Fixed Orientation Stability:** Maintain your camera or eyepiece alignment—no rotation means consistent framing and guide star tracking.

## Overview

The Astromania 1.25" High Precision Double Helical Focuser delivers ultra-fine 0.05mm focusing accuracy with a smooth 10mm stroke, crafted from durable full metal. Designed for telescopes and telephoto lenses, it features fixed orientation to prevent rotation of mounted cameras or eyepieces, ensuring stable framing. Compatible with M31X0.5 and M42X0.75 threads and equipped with a graduated scale, it enables repeatable, precise focus adjustments—perfect for serious amateur astronomers and astrophotographers seeking flawless image sharpness.

## Description

Product description Why Choose Us Many telescopes have a focuser which does not allow very precise focusing. Especially difficult jobs such as focusing on a planet can be a real challenge. This helical focuser elegantly overcomes the problem. You need to do nothing more than to connect it to your existing focuser. Primary mirror interfaces: M31X0.5/M42X0.75 The one side of double helical focuser is M31X0.5 male thread, including a M31X0.5 female thread to M42*0.75 male thread Adapter which you can get M31X0.5 male thread or M42X0.75 male thread on this side. Main Feature Accuracy 0.05mm Interface: 1.25" with M42*0.75 male thread Focusing stroke: 10mm Minimum length: 46mm Longest length: 56mm Color: black Be made by full metal Help To precisely Focus The Focuser has A Fixed Orientation A further advantage is that the accessories, like a camera, do not rotate with the focuser. Therefore the orientation of the image remains unchanged. Via the optional adapter T2i-T2i ( Asin:B01NCS8RW6 ), the focuser can be easily attached to any male T2-thread, so the connection to your telescope becomes child's play. Setting scale - for finding the optimal focus position again A graduated scale always shows you the focus position you have just set. Once you've found the perfect point of focus, then you just need to remember this setting on the scale - you will then always be able to find it in future. The scale itself is similar to the millimetre markings on a ruler, but each marking here moves the focuser by only around 0.05 mm. Sharper focused Planets Via The Helical Mechanism Once the helical focuser is attached, simply turn the focusing knob with Anti-slip texture - which you can control easily even with gloves on in winter. The rotating mechanism allows very smooth and continuous focusing, and without any play. Adjustment Accuracy: 0.05mm The accuracy can reach 0.05mm, 10mm focusing stroke, and more precise focusing. Will meet your need for precise focusing during photography or, lightweight and portable, it's more convenient to carry and use. Brass Ring Design 1.25" accessory collar with brass compression insh to prevent the marring of your telescope accessories, will not scratches your expensive eyepiece or zenith mirror, safer and easier to use. Thread For Eliminating Light Effectively reduce stray light interference, not only improve the brightness of the image, but also effectively reduce the dark edges formed, the edge details of the image are clearer.

Review: Great all around unit - This unit is just what I needed to achieve micro-adjustment focusing when taking pictures through my grab and go telescope, especially at night. The adjustment is very easy and smooth, eliminating a lot of wobble when fine tuning.
Review: Crappy packing, durable focuser. - The terrible packing job done by desertcart is testament to the mechanical quality of the focuser. It's little box was put inside a long shoebox and it bounced around everywhere, destroying the box and tearing a hole along the outer box seam. I'm amazed it arrived intact. It's a bit tight and will need to be worked over a bit to loosen up, but otherwise it does what it says it does.

## Features

- For guider scope or finder scope interface; solution for telescopes or telephoto lenses with sluggish focusing; fixed orientation so no rotation of mounted cameras or eyepieces or field of view with guide star when focusing
- Upgrade R and P focuser by adding to the end of one focuser by using Astromania M42x0.75 Female to M42x0.75 Female Thread Telescope Adapter 9mm; please make sure that there is M42x0;75 male thread on R and P focuser
- Made by full metal; one side of double helical focuser is M31X0.5 male thread; 1.25 inch accessory collar with M42x0.75 male T-thread flangeand accesory collar thumbscrews on the other side that install StarShoot AutoGuider or 1.25 inch eyepiece
- Interface: 1.25 inch with M42x0.75 male thread; primary Mirror Interfaces: M31X0.5 or M42X0.75; include M31X0.5 female thread to M42x0.75 male thread Adapter which get M31X0.5 male thread or M42X0.75 male thread on this side
- Accuracy 0.05mm; focusing stroke: 10mm; minimum length: 46mm; longest length: 56mm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07FDPMZ98 |
| Additional Features | 0.05mm Precision Scale, 10mm Focuser Stroke |
| Best Sellers Rank | #91 in Telescope Photo Adapters |
| Brand | Astromania |
| Compatible Devices | Auto Guider, Eyepiece, Telescope |
| Customer Reviews | 4.2 out of 5 stars 65 Reviews |
| Eye Piece Lens Description | Helical |
| Field Of View | 1.7 Degrees |
| Finderscope | Reflex |
| Focal Length Description | 9 millimeters |
| Focus Type | Fixed Focus |
| Item Weight | 3.2 Ounces |
| Manufacturer | Astromania |
| Manufacturer Part Number | SKU_AM_HDHF1025C |
| Model Name | RM |
| Model Number | SKU_AM_HDHF1025C |
| Mount | Altazimuth Mount |
| Objective Lens Diameter | 56 Millimeters |
| Telescope Mount Description | Altazimuth Mount |

## Product Details

- **Brand:** Astromania
- **Compatible Devices:** Auto Guider, Eyepiece, Telescope
- **Eye Piece Lens Description:** Helical
- **Finderscope:** Reflex
- **Focal Length Description:** 9 millimeters
- **Focus Type:** Fixed Focus
- **Item Weight:** 3.2 Ounces
- **Model Name:** RM
- **Objective Lens Diameter:** 56 Millimeters
- **Telescope Mount Description:** Altazimuth Mount

## Images

![Telescope Helical Focuser, Double Helical Focuser with 0.05mm Scale and 10mm Focusing Stroke, High Precision Telescope Accessories Focuser 1.25 Inch for Astronomical Telescopes Guidescope - Image 1](https://m.media-amazon.com/images/I/71Tfrvb5EaL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great all around unit
*by R***Y on October 26, 2025*

This unit is just what I needed to achieve micro-adjustment focusing when taking pictures through my grab and go telescope, especially at night. The adjustment is very easy and smooth, eliminating a lot of wobble when fine tuning.

### ⭐⭐⭐⭐⭐ Crappy packing, durable focuser.
*by D***R on October 12, 2025*

The terrible packing job done by Amazon is testament to the mechanical quality of the focuser. It's little box was put inside a long shoebox and it bounced around everywhere, destroying the box and tearing a hole along the outer box seam. I'm amazed it arrived intact. It's a bit tight and will need to be worked over a bit to loosen up, but otherwise it does what it says it does.

### ⭐⭐⭐⭐ Average quality
*by E***0 on April 19, 2024*

For what I payed I'm satisfied with it but if you want top notch quality look elsewhere. Important dimensions: On the scope side the inside diameter is 27mm, some of my longer eyepieces won't fit because of that restriction. Measuring from the eyepiece side down that 27mm restriction is 32mm to 42mm down depending on where you have it focused on its 10mm range. If you plan to attach anything to the 42mm threads on the eyepiece side, everything I attached did not cover the eyepiece holder screws but you might find you need longer screws. The screw for the eyepiece holders is M3.

## Frequently Bought Together

- Astromania 1.25" High Precision Double Helical Focuser with 0.05mm Scale for Telescope Lenses/Finder & Guidescope
- Astromania M42X0.75 Female to M42X0.75 Female Thread Telescope Adapter - 9mm
- SVBONY Telescope Accessories Focuser Adapter 1.25 inches Adapter M42X0.75 Reflector Telescope Eyepiece Adapter

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-06-04*