The Canon 24-105mm f4L on the Fujifilm GFX 50R

Empty Picnic Tables, Waterloo Ice House - Austin, Texas

Empty Picnic Tables, Waterloo Ice House – Austin, Texas

I took this snapshot at the same dinner outing that I mentioned yesterday. I had brought along my latest gadget to show Chuck — a friend and fellow photographer. In addition to our conversations and sharing food, we would often show off our latest photographic gadgets. Chuck brought his 7artisans lens, which I discussed yesterday. I brought a Canon lens attached to my Fujifilm GFX 50R.

Early this year, I reviewed my first ever lens adapter, the FotodioX Pro TLT ROKR. That enabled me to attach an old Mamiya film lens to my Fuji GFX 50R. Recently, I bought another adapter, the FotodioX Pro Fusion EF to GFX. This allows me to use my Canon DSLR lenses on the GFX. Remarkably, it autofocuses and controls the aperture on the Canon lens.

The empty picnic tables are courtesy of the Canon 24-105mm f4L at the widest 24mm. The corners are vignetted and slightly soft, but everything else comes out satisfactory. Since the lens’ image circle doesn’t cover the GFX’s sensor, I put it into a 35mm crop mode. Conveniently, there is a physical switch on the FotodioX adapter that shifts between 35mm and standard GFX mode.

Cheeseburger, Waterloo Ice House - Austin, Texas

Cheeseburger, Waterloo Ice House – Austin, Texas

I promised a few days ago that I wasn’t going to show any more food photos. I guess I lied inadvertently. However, think of this as more of a lens/adapter test than anything else. The picture of the cheeseburger is from the same lens at 90mm.

The focusing is not super quick. Certainly slower than native Fuji lenses. However, it’s more than adequate for snapshots and general observational photography. I wouldn’t shoot sports with it. But the GFX 50R itself isn’t that kind of camera anyway.

I’ll show you more of what this adapter can do over the next several posts.

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9 thoughts on “The Canon 24-105mm f4L on the Fujifilm GFX 50R

    1. Yes, high cholesterol, high blood pressure, and all the modern day dietary ills are fully cured when using the Fuji GFX and the adapter. At least that’s what I read somewhere on the internet. YMMV.

  1. Good morning

    It has been a while since we have typed about using the Fuji 50R. I’m glad to see that you are still working with it. I gave it a go with adapted lenses; Canon EF, Nikon F, and Leica M & R. But I have ended the effort, the EVF, rolling shutter, and the ease that settings will change drove me crazy.

    My experience with the EF lenses was similar to what you have mentioned here. Though some lenses actually covered the 16×9 full frame crop fairly well if you are stopped down and close enough. I have 16-35 f2.8 EF L, and as you mentioned 24mm (and wider) seemed to be the place where coverage seemed to demand the 35mm format.

    Concerning the adapter, which I also had, be sure to update the firmware. The aperture in my Zeiss 50 f1.4 Planar (Classic) ZE would chatter, and my 85 f1.8 EF and 200 F2.8 EF L tended to hunt enough that manual focus was preferable with the original firmware.

    Not to say that there were not some pleasant surprises using 35mm format lenses, such as the following:

    Leica 100mm f2.8 APO-Macro
    Nikon 135mm f2.8 AIS
    Zeiss 85mm f1.4 Planar (Classic) ZF.2
    Leica 135mm f3.4 APO-Telyt
    Leica 75mm f2 Summicron M
    Nikon 18mm f3.5 AIS (in 35mm mode, and a little larger)

    Good luck and have fun.

    1. Thank you, PaulB. Great to hear from you. So are you saying that if I update the firmware, the 85mm f1.8 will focus faster? Any way to estimate how much faster it is with the newer firmware?

  2. I don’t know if focusing will be faster, since that also involves the voltage transmitted to the motor, and the size & weight of the lens groups being moved. I would expect it to be more positive (less hunting and less flicking of the aperture blades). In my case the lens would intermittently not lock focus on the subject, but constantly try to fine tune the focus.

    Firmware updates are important with electronic adapters, since the adapter needs to maintain compatibility with the body and any firmware updates loaded into it. Sometimes body updates are incompatible with adapters until the adapter firmware is updated.

    If you haven’t checked already, check the Fotodiox website for the firmware download process, particularly if you are a Mac user. When I tried it they only had a download routine that supported PCs.


    1. Thank you, PaulB. I’ll need to figure out how to do the firmware update. I use only Mac, however, my son might have an old gaming PC.

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