# Lens Mount Adapter JYC for Canon EOS (EF/EF-S) to M42 with Aperture Lock

**URL:** https://aio.lv/en/product--jyc-sb1985--11819806
**Data updated:** 2026-03-09 11:07 (EET)
**Category:** Camera Lenses
**Manufacturer:** JYC
**Manufacturer code:** SB1985
**EAN:** 5904647820951
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.99 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 5.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--jyc-sb1985--11819806

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Mount adapter that allows attaching M42-mount lenses to Canon EOS cameras with EF/EF-S mounts. Manufactured by JYC, it preserves mechanical connection and includes an aperture/lock mechanism to fix diaphragm position. Suitable for photographers who want to use vintage or manual M42 lenses on modern Canon EOS bodies for manual focus and creative control.

## Long description

The JYC Lens Mount Adapter for Canon EOS (EF/EF-S) to M42 with Aperture Lock enables use of M42-threaded manual lenses on Canon EOS bodies. This metal adapter provides a mechanical connection that aligns M42 lenses to the Canon EF/EF-S mount flange distance, allowing manual focus and aperture control while preserving the optical characteristics of vintage and third‑party glass. The built‑in aperture lock mechanism secures the lens diaphragm at a chosen position to maintain exposure and depth‑of‑field settings during shooting.
Advantages
The adapter is constructed for stable mounting and reliable alignment between lens and camera, reducing play and tilt for consistent framing. The aperture lock gives photographers the ability to stop down or keep the diaphragm open as needed for metering and focusing, while the straightforward mechanical design requires no electronics or firmware and is compatible with a wide range of M42 lenses. Its compact profile keeps the overall setup close to the camera body for easier handling and balance.
Suitable for (tasks / use cases)
 Mounting vintage or manual M42 prime lenses on Canon EOS (EF/EF-S) bodies
 Manual-focus portrait, macro, and creative photography
 Adapting classic glass for cinematic or stills work with manual aperture control
 Photographers experimenting with lens character, bokeh and manual exposure
Key specifications
 Mount conversion: M42 lens to Canon EOS (EF/EF-S) camera
 Material: metal alloy construction for durability and stable mount
 Aperture mechanism: manual aperture control with a lock to fix diaphragm position
 Compatibility: supports manual focus and manual aperture operation from M42 lenses
 Finish: matte surface to reduce reflections and light scatter
How to use
Attach the adapter to the camera by aligning it with the Canon EF/EF-S mount and rotating until it locks into place. Screw the M42 lens into the adapter thread until secure. Set the lens aperture manually on the lens, then use the adapter's aperture lock to fix the diaphragm at the chosen setting if required. Compose and focus manually using the camera's live view or viewfinder; metering can be performed using the camera’s exposure modes but will not provide electronic communication between lens and body.
Usage recommendations
For best results, check lens flange distance and ensure the M42 lens is clean and functions mechanically before use. When using lenses without a built‑in aperture ring, set the diaphragm to the desired position before mounting and use the lock to prevent unwanted movement. Use manual or live‑view focus magnification for precise focusing and consider using a tripod for critical framing and stability.

## FAQ

### How much does the JYC Adapter Canon EOS (EF/EF-S) to M42 cost, and is it available for purchase?

The price is 6.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 02.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All JYC products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized JYC service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11819806/67222147_large.webp