---
product_id: 378326790
title: "Fotasy Adjustable M42 42mm Screw Mount Lens to Cannon EOS RF Mount Adapter, M42 RF Adapter, M42 Lens to EOS RF, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10"
brand: "fotasy"
price: "¥11825"
currency: JPY
in_stock: true
reviews_count: 5
category: "Fotasy"
url: https://www.desertcart.jp/products/378326790-fotasy-adjustable-m42-42mm-screw-mount-lens-to-cannon-eos
store_origin: JP
region: Japan
---

# Compatible with Canon EOS RF series 42mm precision screw mount Adjustable copper lens mount Fotasy Adjustable M42 42mm Screw Mount Lens to Cannon EOS RF Mount Adapter, M42 RF Adapter, M42 Lens to EOS RF, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10

**Brand:** fotasy
**Price:** ¥11825
**Availability:** ✅ In Stock

## Summary

> 🔗 Unlock timeless optics with modern precision!

## Quick Answers

- **What is this?** Fotasy Adjustable M42 42mm Screw Mount Lens to Cannon EOS RF Mount Adapter, M42 RF Adapter, M42 Lens to EOS RF, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10 by fotasy
- **How much does it cost?** ¥11825 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/378326790-fotasy-adjustable-m42-42mm-screw-mount-lens-to-cannon-eos)

## 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

- • **Robust & Durable Build:** Solid copper mount ensures long-lasting, reliable performance under pressure.
- • **Infinity Focus Locked In:** No need for recalibration—shoot sharp landscapes and portraits effortlessly.
- • **Precision Adjustable Fit:** Fine-tune alignment with an easy screw key for flawless framing every time.
- • **Seamless Vintage Lens Revival:** Transform your classic M42 lenses into modern RF mount powerhouses.
- • **Universal Canon RF Compatibility:** Works flawlessly with EOS R, RP, Ra, R3, R5, R6, R7, and R10 models.

## Overview

The Fotasy Adjustable M42 to Canon EOS RF Mount Adapter enables seamless use of 42mm screw mount lenses like Takumar and Helios on Canon's latest mirrorless RF cameras. Featuring an adjustable copper mount for perfect lens alignment and guaranteed infinity focus, this durable adapter supports manual exposure and focus, bridging vintage glass with cutting-edge camera bodies.

## Description

Fotasy Professional designed M42 42mm Screw Mount Lens to Cannon RF Mirrorless Camera Adapter.Lens mount is ADJUSTABLE. If the center of the lens IS NOT aligns to the center of the camera, pls use the screw key to adjust the adapter.Infinity remains unchanged, so the lens does not need to be re-collimated or shimmed.Compatible with M42 42mm Screw Mount Lens, eg Takumar m42 Lens, Helios M42Compatible with Canon RF Mount Mirrorless cameras EOS R RP Ra R3 R5 R6 R7 R10

Review: Sturdy, well made, functions perfectly!
Review: Great adapter, fits firmly and strong built.

## Features

- M42 Lens EOS R Adapter, M42 Lens EOS RP Adapter, allows 42 42mm Screw Mount Lens (pentax Takumar, Helios etc) to fit on Cannon EOS RF Mount Mirrorless Camera
- Infinity Focus Guaranteed.
- Adjustable Copper Lens Mount, Solid and Durable
- There is NO electrical contacts in the adapter ring. Exposure and focus has to be adjusted manually. Automatic diaphragm, auto-focusing, or any other functions will not operated with using this adapter.
- M42 RF Adapter, M42 EOS RF adapter, compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10
- Fits Helios 44-2 58M M42 lens Pentax takoma M42 lens etc

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07KZ877K7 |
| Best Sellers Rank | #57,230 in Electronics ( See Top 100 in Electronics ) #228 in Camera Lens Caps |
| Item model number | ER42 |
| Manufacturer | Fotasy |
| Product Dimensions | 7.62 x 7.62 x 4.83 cm; 85.05 g |

## Product Details

- **Brand:** Fotasy
- **Compatible mountings:** Canon RF
- **Focal length description:** 42 millimeters
- **Lens type:** Standard

## Images

![Fotasy Adjustable M42 42mm Screw Mount Lens to Cannon EOS RF Mount Adapter, M42 RF Adapter, M42 Lens to EOS RF, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10 - Image 1](https://m.media-amazon.com/images/I/61TJZO8E7IL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by A***. on 12 December 2025*

Sturdy, well made, functions perfectly!

### ⭐⭐⭐⭐⭐ Review
*by T***J on 9 November 2025*

Great adapter, fits firmly and strong built.

### ⭐⭐⭐⭐⭐ Review
*by R***B on 20 November 2025*

A great little adapter that allows the rotation to be adjusted so you can get the lens twisted the correct way. Cheap enough to just get one for each adapted lens.

## Frequently Bought Together

- Fotasy Adjustable M42 42mm Screw Mount Lens to Cannon EOS RF Mount Adapter, M42 RF Adapter, M42 Lens to EOS RF, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10
- Fotasy FD Mount Lens to Cannon EOS RF Mount Adapter, FD EOS R Adapter, FD RF, FD FL Classic Manual Lense Adapter, Compatible with Canon EOS R Mirrorless Camera EOS R RP Ra R3 R5 R6 R7 R10
- Fotasy Copper PK Lens to Canon EOS RF Mount Adapter, Pentax K EOS R Adapter, Compatible with Pentax K Mount Lense & Canon EOS R Mirrorless Camera EOS R/RP/Ra / R5 / R6

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**Shop now:** [https://www.desertcart.jp/products/378326790-fotasy-adjustable-m42-42mm-screw-mount-lens-to-cannon-eos](https://www.desertcart.jp/products/378326790-fotasy-adjustable-m42-42mm-screw-mount-lens-to-cannon-eos)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-02*