---
product_id: 434153037
title: "Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs)"
brand: "fotasy"
price: "€ 27.64"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/434153037-fotasy-m39-39mm-to-m42-42mm-adapter-ring-for-42mm
store_origin: FI
region: Finland
---

# 39mm to 42mm Thread Compatible with Focusing Helicoid All Metal Design Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs)

**Brand:** fotasy
**Price:** € 27.64
**Availability:** ✅ In Stock

## Summary

> 🔧 Transform Your Lens Game!

## Quick Answers

- **What is this?** Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) by fotasy
- **How much does it cost?** € 27.64 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/434153037-fotasy-m39-39mm-to-m42-42mm-adapter-ring-for-42mm)

## Best For

- fotasy enthusiasts

## Why This Product

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

## Key Features

- • **Dual Pack Value:** Get two adapter rings for the price of one—perfect for backup or sharing.
- • **Enhanced Creativity:** Unlock new photographic possibilities with this essential accessory.
- • **Durable Construction:** Crafted from high-quality metal for long-lasting performance.
- • **Precision Engineering:** Designed for a snug fit, ensuring no light leaks or misalignment.
- • **Seamless Compatibility:** Easily adapt your M39 lenses to M42 mounts for versatile shooting.

## Overview

The FotasyM39 to M42 Adapter Ring allows photographers to effortlessly connect M39 lenses to M42 mounts. Made from durable all-metal materials, this adapter ensures a secure fit and compatibility with 42mm focusing helicoids, making it an essential tool for any serious photographer looking to expand their lens options.

## Description

Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs)

## Features

- M39 to M42 (39MM - 42MM Thread) Adapter
- All Metal Design
- Can be used with a 42mm Focusing Helicoid

## Product Details

- **Brand:** Fotasy
- **Focal Length Description:** 42 millimeters
- **Lens Type:** Standard
- **Compatible Mountings:** M39
- **Camera Lens Description:** 42 millimetres

## Images

![Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) - Image 1](https://m.media-amazon.com/images/I/61G5VNTosuL.jpg)
![Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) - Image 2](https://m.media-amazon.com/images/I/81nmSwi1+gL.jpg)
![Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) - Image 3](https://m.media-amazon.com/images/I/81oo+KwRtkL.jpg)
![Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) - Image 4](https://m.media-amazon.com/images/I/81gD0V82ZSL.jpg)
![Fotasy M39 (39mm) to M42 (42mm) Adapter Ring for 42mm Focusing Helicoid (2 Packs) - Image 5](https://m.media-amazon.com/images/I/61mAW3zrhOL.jpg)

## Available Options

This product comes in different **Style Name** options.

## Questions & Answers

**Q: Why are reviews for a screen protector? I want to know about this Helicoid.**
A: Well, the helicoid works as intended. I haven't had any problems with it so far. I use it along with a thin M42 to Sony e-mount adapter and extension tubes to use miscellaneous lenses on my camera. A cheap 39mm to M42 adapter ring will allow many enlarger lenses to be attached to an M42 mount for example. I have a couple at different lengths. Pick the amount of extension that suits your purpose.

**Q: How many rotations are required to go from 35mm to 90mm?**
A: The tube states this in the fine print. It may state the pitch of the tube so you divide the travel (big number minus little number) by the pitch to get degrees of rotation. A full twist is 360 degrees.

**Q: why is there no canon ef version ???**
A: Canon EF lenses use connects to focus the lens. The EF is electronic focus. Many tubes are fully manual and will NOT connect the lens electrical contacts to the camera. Canon EF lenses use an electronic aperture so a manual tube makes Canon EF lenses nearly useless!

**Q: What is the size of the opening at the rear (camera end)? I want to see if a large lens element will clear it.**
A: The opening are about 38mm with a 42 mm thread on both ends. The lens elements are normally smaller than the tube’s internal dimension. If lens element is in the lens Mount, the glass element must be smaller than the Mount of 42 mm. Got to have some metal thickness to hold things. Putting something in the helicoil makes no sense. The inside of the helicoil is just smooth metal. Lens elements in helicoil will not work. You can not put a tele-extender in the helicoil.   The helicoil provides physical distance to shorten your  lens focus. Any use of optics to increase shortness of focus should be as close to the lens as possible, mounted on the lens. Further away from the lens would clip the projected image and cause distortion.

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**Shop now:** [https://www.desertcart.fi/products/434153037-fotasy-m39-39mm-to-m42-42mm-adapter-ring-for-42mm](https://www.desertcart.fi/products/434153037-fotasy-m39-39mm-to-m42-42mm-adapter-ring-for-42mm)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-01-26*