---
product_id: 38932445
title: "Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black"
brand: "astromania"
price: "€ 34.40"
currency: EUR
in_stock: true
reviews_count: 9
url: https://www.desertcart.pt/products/38932445-astromania-bahtinov-mask-that-focusing-for-telescope-fm140mm-for-tube
store_origin: PT
region: Portugal
---

# Universal Fit Precision Focusing Durable Material Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black

**Brand:** astromania
**Price:** € 34.40
**Availability:** ✅ In Stock

## Summary

> 🔭 Focus Like a Pro – Your Universe Awaits!

## Quick Answers

- **What is this?** Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black by astromania
- **How much does it cost?** € 34.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/38932445-astromania-bahtinov-mask-that-focusing-for-telescope-fm140mm-for-tube)

## 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

- • **Gentle Grip:** Three-post mounting with non-scratching silicon sleeves ensures telescope protection.
- • **Precision Focusing:** Eliminate guesswork with mathematical accuracy for stellar clarity.
- • **Durable Construction:** Crafted from 2mm thick laser-cut plexiglass, built to withstand the elements.
- • **User-Friendly Design:** Quick and easy setup for both reflectors and refractors, making stargazing a breeze.
- • **Versatile Compatibility:** Adjustable for optical tubes ranging from 150mm to 200mm, perfect for all telescopes.

## Overview

The Astromania Bahtinov Mask is a precision tool designed for effortless telescope focusing. Made from durable laser-cut plexiglass, it fits a wide range of optical tubes (150mm-200mm) and features a three-post mounting system that protects your telescope while ensuring perfect alignment. Ideal for both reflectors and refractors, this mask takes the guesswork out of stargazing, making it a must-have for any astronomy enthusiast.

## Description

Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black

## Features

- Bahtinov masks take the guesswork out of focusing and even get over the seeing conditions as it is a mathematical type approach to the task; the best focus for your telescope quickly and easily
- Suitable for use on all types of telescope; they are made from precision laser cut enforced plexiglass that is stiff and long lasting; they will never be brittle in the cold; unlike some other masks which are made from normal plastics
- The masks grip the telescope tube gently but firmly with three metal posts which have non-scratching silicon sleeves to protect valued telescope surface; mask remains centered since 3-post mounting; while fitting a wider range of telescopes
- Made from 2mm thick laser cut plexiglass and securing screws are capped with soft plastic so that do not damage telescope; They have adjustment latitude of about 150-200mm that adjustable to fit optical tubes unlike masks which only fit one telescope
- Please be assured these focusing masks will work excellently for both reflectors and refractors with whatever focal length; all you need to do is to measure telescope tube size and choose right size of mask contact us if not sure where to measure

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Care Instructions | Hand Wash Only |
| Material Type | Metal |
| Item Length Description | 150mm millimeters |
| Theme | Star |
| Seasons | All |
| Specific Uses For Product | Astronomy, Telescope Focusing |
| Apparel Occasion and Lifestyle | Work |
| Occasion Type | Christmas |
| collar-type | Mandarin Collar |
| Color | Black |
| Fit Type | Regular Fit |
| Style Name | Tube |
| Sleeve Type | Sleeveless |
| Additional Features | Adjustable to fit a wide range of optical tubes, 3-post mounting for central alignment, suitable for various types of telescopes |

## Images

![Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black - Image 1](https://m.media-amazon.com/images/I/61t8C6JoKAL.jpg)
![Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black - Image 2](https://m.media-amazon.com/images/I/71LJXnP6+nL.jpg)
![Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black - Image 3](https://m.media-amazon.com/images/I/611n8fZYi+L.jpg)
![Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black - Image 4](https://m.media-amazon.com/images/I/61WpmHWGDeL.jpg)
![Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black - Image 5](https://m.media-amazon.com/images/I/61thKFor1tL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Great price for good quality
  

*by R***Y on Reviewed in the United States on August 9, 2024*

Due to adjustments I use this on several OTAs and am quite satisfied

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works very well. Does exactly what it's supposed to do.
  

*by C***4 on Reviewed in the United States on July 23, 2017*

I bought 2. One for my 6" and one for my 8". This is specifically about the 6" so I'll only make a passing mention of the 8". That one doesn't make spikes well and what it does make are hard to discern. This one, the 6", is fantastic. Used this the day it arrived. I was imaging Saturn and Jupiter that night. Slewed to a nearby star, focused using the bahtinov mask which was a breeze. Took all of about 5 seconds to focus using this. Slewed back to Saturn and started imaging.

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    I liked this mask but even under the sun
  

*by M***O on Reviewed in the United States on July 10, 2018*

I liked this mask but even under the sun, the heat warps the plastic, should have been made of sturdier stuff.

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-02-04*