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Fringer Contax 645 – Fujifilm GFX50s 

Smart adapter user’s manual 

(v2.0) 

 

Important!

 Please read this manual carefully before using the adapter. Be noted: 

The  activation  process  is 

NOT  required  anymore

.  You can  use  the  adapter  on 

your  camera  directly.  Thus,  G.CAP  (the  device  for  activation)  is  no  longer 
provided with the adapter.     
 

1.

 

General descriptions 

This  adapter is  compatible  with  Contax 645 and Fujifilm G mount protocols. It can control 

lens’ aperture electronically, auto focus (some of C645 lenses only) and support Exif recording. 

All C645 lenses are supported. See the table below. 

Contax 645 lenses 

AF supported (Firmware v2.0) 

 

Distagon T* 3,5/35 

 

Distagon T* 2,8/45 

 

Distagon T* 3,5/55 

 

Planar T* 2/80 

 

Apo-Makro-Planar T* 4/120 

N/A 

 

Sonnar T* 2,8/140 

 

Sonnar T* 4/210 

 

Tele-Apotessar T* 4/350 

 

Vario-Sonnar T* 4,5/45-90 

 

Sonnar T* 2,8/140 + Mutar 1,4x T* 

 

Sonnar T* 4/210 + Mutar 1,4x T* 

 

Tele-Apotessar T* 4/350 + Mutar 1,4x T* 

 
The adapter has been tested on GFX50s camera body. Theoretically it may support future G 

mount bodies.   

Please be noted that so far AF is an experimental feature. On one hand, not all lenses support 

AF. On the other, even for those lenses supporting AF, the performance may not be good enough 
for you. If the AF speed or accuracy can’t satisfy you, please change to MF mode. All lenses can 
work under MF mode. 

       

2.

 

Installation and activation 

I suggest connecting the lens with the adapter first. After that, install the adapter onto the 

body. If you need to separate the lens from the adapter while the adapter is connected with the 
body, you must turn off power first. 

Although  Fujifilm  G  mount  is  not  an  open  design,  we  tried  our  best  to  make  C645  lenses 

Summary of Contents for Contax 645

Page 1: ...Sonnar T 2 8 140 Y Sonnar T 4 210 N Tele Apotessar T 4 350 N Vario Sonnar T 4 5 45 90 N Sonnar T 2 8 140 Mutar 1 4x T Y Sonnar T 4 210 Mutar 1 4x T N Tele Apotessar T 4 350 Mutar 1 4x T N The adapter has been tested on GFX50s camera body Theoretically it may support future G mount bodies Please be noted that so far AF is an experimental feature On one hand not all lenses support AF On the other ev...

Page 2: ...o the previous versions of firmware now the aperture and focal length information are all displayed and recorded correctly See the following table for details Contax 645 lenses Max aperture Correct aperture on LCD EVF and in EXIF Recorded focal length Correct focal length in EXIF Distagon T 3 5 35 F3 5 Y 35mm Y Distagon T 2 8 45 F2 8 Y 45mm Y Distagon T 3 5 55 F3 5 Y 55mm Y Planar T 2 80 F2 0 Y 80...

Page 3: ...ok at GFX50s aperture control strategy 1 Under MF mode AM MF switch on MF the aperture blades are always wide open during view finding metering and focusing until the shutter release button is pressed 2 Under AF mode with aperture priority disabled shutter speed dial on positions other than A aperture blades move at once when you change aperture setting During AF process the aperture blades may te...

Page 4: ...ans Contax645 GFX adapter V2 00 2 Get the adapter off the camera Do not connect G CAP if provided either Make sure not to connect the adapter with the computer while it is installed on a camera body 3 Plug the Micro USB cable to the port inside the tripod mount of the adapter Be careful Mind the direction and do not push too hard Or you may damage the Micro USB port of the adapter 4 Connect the ot...

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