Lens correction profile support in Steelsring lens adapter for FUJIFILM

Lens Correction Profile Support in Steelsring adapters for FUJIFILM cameras

Since 3.03 firmware releases, Steelsring EF/GFX adapter officially supports distortion and TCA correction for selected EF lenses, and Steelsring will add LCP support to our other lens adapters for FUJIFILM cameras.

Steelsring profiles EF lens optical characterics, convert the distortion and chromatic aberration correction parameters to FUJIFILM model, then incorporats them into EF/GFX firmware releases, and provide to FUJIFILM camera body when being required. These correction parameters are used in following scenairos:

  1. In  camera JPEG production
  2. Lens profile info in RAF file headers
  3. Movie shooting

Steelsring noticed there are some differences in using these correction data when adapter works in different modes. In adapter mode, the distortion correction are disabled or ignored in JPEG productions and RAF files by the camera, an wild guess is to avoid conflicts with those manually correction parameters under adapter setting item of camera body menus. The RAF output file will contain a fake or zero effect distortion correction info to make it totally useless in post processing( can be verified in Photoshop or RawTherapee), in-camera JPEG file was not calibrated either. In FUJIFILM lens mode, everything is normal, in-camera JPEG files are calibrated, and correct parameters are embedded in the RAF files. Even better, user finally can decide how to apply them when importing RAF files in adobe camera raw, just like importing RAF files shot with FUJIFILM GF lenses.

Steelsring EF/GFX adapter customers are suggested to carefully choose adapter’s work mode based on the requirement for Lens Correction Profiles. If a customer want it in both JPEG and RAF files, please let adapter works in FUJIFILM lens simulation mode. 

For an EF lens not profiled by Steelsring yet, it doesn’t matter which working mode adapter is, only a fake or zero effect lens correction profile will be used for JPEG or being embedded for RAF files. For supported lenses, please check firmware release notes.

Followings are some demos from our real testing, please lower down volume level of speaker before watch videos.


Pictures were shot with EF 17-40mm f/4 L @ 17mm , with 35mm clipping turned off,  RAW + JPEG 

Shows the difference of in-camera JPEG files with distortion and TCA corrections and JPEG output from RAF file with distortion and TCA disabled in Photoshop.


Pictures were shot with EF 17-40mm f/4 L @ 40mm , with 35mm clipping turned off, RAW + JPEG 

Shows the difference for in-camera JPEG files with distortion and TCA corrections and JPEG output from RAF file with distortion and TCA disabled in Photoshop.

This video shows the RAF file post-processing  in Photoshop

Since lens profile exists in the RAF file, PS will allows customer adjust the amount of distortion correction and enable/disable TCA correction, 

Demo picture was shot with EF 17-40 L @ 17 mm too, RAW + JPEG 

Video shot with GFX 100s and EF 17-40mm f/4 L @ 17mm

In adapter mode, camera turns off in camera distortion correction, but keeps TCA correction.

This video shows the scene without distortion correction.

Please ignore any possilble influences caused by handheld panning of camera.

Shot with GFX 100s and EF 17-40mm f/4 L @ 17mm. 

In FUJI lens mode, in camera distortion correction is always active when shooting. 

This video shows the real effect of distortion correction

Please ignore any possilble influences caused by handheld panning of camera.

EF/FX 2.03 and EF/GFX 2.05 Firmware update

Common update for EF/FX and EF/GFX adapter

1) Updated Lens AF driving mechanism, improve the AF locking rate and accuracy.
2) Updated Lens IS driving mechanism, eliminate IS activation noise of some EF lenses
3) Fixed a program bug, reduce the chance of camera LCD black out.

EF/FX PDAF performance update for below lenses

Sigma 105 f/1.4 ART
Tamron SP 45 f/1.8 Di VC USD
Tamron 100-400 f/4.5-6.3 Di VC USD

For EF/FX firmware download, please visit here.

For EF/GFX firmware download, please visit here.

Nikon F mount AF adapter for FUJIFILM GFX is almost there.

Main features:

  1. Support Nikon AF-S G and E type lens, and AF-P G type lens contrast based AF in GFX 50s body.
  2. Electromagnetic diaphragm of type E Lens can be controlled by GFX 50s body, allows AF in full open ( decided by camera body ) and step down for exposure.
  3. Diaphragm of G type lens was manually controlled by aperture ring of adapter in real-time,  so AF is conducted in real effective aperture as exposure. AF performance may be bad in low light/contrast, benefits are 1) Real aperture priority,  2) and totally no noise of consistent IRIS moving.
  4. Full EXIF info recording. ( For G type lens, only the current max open aperture was displayed and recorded, no way to adjust it ).
  5. Lens VR was support and effective on demand.

FX mount version adapter is in design phase, maybe with better performance of PDAF and auto aperture control version for your choice.


Support to AF-D type lens will be very limited, EXIF may works, but no AF absolutely.

EF/FX 2.02 and EF/GFX 2.04 Firmware updates

For both EF/FX and EF/GFX, followings were updated:

1) Lens Image Stabilizer activation mode change: From always on after camera powered on to effective only when shutter button was half pressed and camera exposing.
2) Solved the problem that sometimes lens was identified as wrong lens.
3) Improve AF accuracy for all lenses, and AF speed for Canon EF 100-400 lenses
4) Disable lens parking in infinity end if an AF lens is set to MF mode during picture reviewing or camera powered off.

Additionally for EF/FX only:

5) PDAF performace update for
EF 35mm f/1.4L II
EF 50mm f/1.2L ,
EF 50mm f/1.4
EF 85mm f/1.2L II

For details , refer to here.