Fringer Contax 645-GFX Smart Adapter Upgraded


There is a welcome Firmware upgrade for the Fringer Contax 645-GFX Smart adapter.

In short: you don’t need the GF 63mm anymore for the activation. All lens model recognized. Correct aperture/focal length info. Full EXIF support.

Fringer worked on the upgrade based from feedback he got from our (wonderful and gigantic) Fujifilm GFX facebook group. And remember: if all you want are fast news and rumors about Fujifilm GFX, then make sure to follow the Fujifilm GFX facebook page.

You can get the latest firmware at fingeradapter here and purchase the adapter here.

Fujifilm GFX 50s: BHphoto, Adorama, AmazonUS

Full Press Release

Inspired by a demo video of some adapter prototype of others, I decided to dig deeper into Fujifilm’s G mount protocol. After a busy weekend’s hard working, I finally solved the puzzle. Version 2.0 of the firmware is highly recommended to current adapter owners.

You may get the latest firmware from and upgrade your adapter.

Or purchase a C645-GFX adapter with firmware 2.0 from

Ver2.0 is significantly improved in following aspects:

1. Recognize different lens models and display aperture correctly

All Contax 645 lenses are recognized correctly. You can control aperture through the ring on lens or the command dial on body. Displayed aperture will be exactly the correct value. Aperture value will be adjusted automatically if Mutar 1.4x applied.

2. No activation required anymore

You don’t need to own or borrow a GF63 to activate the adapter anymore. The adapter can be used directly on your GFX50s body with any Contax 645 lens.

3. Full EXIF support

All information recorded in EXIF of JPEG and RAW files is correct. Now you can recall all the exact settings of your camera when you review a photo taken by C645 lens, Fringer adapter and GFX camera.


By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

What are Cookies?
A cookie is a small file of letters and numbers that is stored in a temporary location on your computer to allow our website to distinguish you from other users of the website. If you don't want to accept cookies, you'll still be able to browse the site and use it for research purposes. Most web browsers have cookies enabled, but at the bottom of this page you can see how to disable cookies. Please note that cookies can't harm your computer. We don't store personally identifiable information in the cookies, but we do use encrypted information gathered from them to help provide you with a good experience when you browse our website and also allow us to improve our site. You can watch a simple video from Google to find more information about cookies.

Cookies used by our Website
The Fujirumors website,, uses the following cookies for the collection of website usage statistics and to ensure that we can . These are anonymous and temporary. By using our website, you agree that we may place these types of cookies on your device.
Read how Google uses data when you use our partners' sites or apps:
Google Analytics Cookie Usage on Websites: Addthis cookies:
Disqus cookies:
Vimeo cookies:
Youtube cookies:

Disabling/Enabling Cookies
You have the ability to accept or decline cookies by modifying the settings in your browser. Please note however that by deleting our cookies or disabling future cookies you may not be able to access certain areas or features of our site. For information about how to disable cookies in your browser please visit the About Cookies website.