Adapting the 47 years old Leica 35mm Summicron Ver III on the Fujifilm X-Pro3 – a visual review

Leica M lenses have been around for close to 70 years with the M mount celebrating its 70th anniversary on Feb 10, 2020, and have generally been held in high regard and mystic amongst its followers. 

And today, with a stroke of luck, I managed to obtain a 47-year old (well, that’s half a century but still far from the oldest versions) Leica Summicron 35mm Version III made in 1973. 

*Note: the Ver II and III have the same optical formulae, and likely differed from the country of manufacture (Germany vs Canada) so I will refer to them as III for simplicity sake here. 

About the Leica 35mm Summicron version III.

A lot has been said about the various versions dating from 1958 onwards but a search shows scant writeups of them being adapted to Fujifilm cameras hence the premise for this writeup. This is version III, the least liked, at least if compared to version IV, which is affectionately nicknamed the KOB (King of Bokeh).  

This version of the 35mm Summicron takes 39mm filters, comes in at 6.040 oz./171.2g and it’s optical design comes in 6 elements and a beautiful 10 blades. Production started in 1969 to 1971 in Germany while later shifted to Canada from 1971 to 1979. One of the nicest designs of this lens is its diminutive size, the lens cap actually is the same size as an Oreo biscuit. 

Yes, even the lens coating has remained intact over the last 47 years.

Firstly, to get the elephant in the room out, yes – the Fujifilm X-mount is an APSC sized sensor camera, aka one will never have the same amount of depth of field as compared to adapting the same lens on a Sony full-frame body, plus due to the 1.5x crop factor, a 35mm focal length ends up an approximately 50mm so my 35mm Summicron on theory performs like a 50mm f2.4 lens on the X-Pro3.

But allow me to tempt you…

Imagine Leica vintage glass on Fujifilm X-Trans in Classic Neg 

and so we start this little visual review and some thoughts on using this setup as we go along. 

My standard disclaimer: 

  1. All images shared here are photographed by me and all edited from raw according to my preferences in LR CC. 
  2. I am not paid to write this and the cameras and lenses mentioned here belong to me and in this sense, allows me to be candid and honest. 
  3. All images here are not to be used without my explicit permission.
  4. The film simulation used here is Fujifilm’s own Classic Negative. 
  5. The equipment used here is Fujifilm X-Pro3 with an M to X-mount Fotasy adapter, a Leica 35mm Summicron version II. 


Using the setup did require some getting used to, and in all honestly, I find using the 35mm Summicron on the X-Pro3 tougher than using it on a Leica M body simply because that the rangefinder focusing mechanism on a Leica M body is much easier on the eyes vs finding focus through the X-Pro3’s EVF. 

For one, the X-Pro3 is a rangefinder inspired designed camera and not a true rangefinder camera. The lack of a back LCD also meant that focusing was really better all done using it’s EVF. 

In some cases, I simply reverted back to zone-focusing and taking heed of the lens minimum focusing distance of 0.7m, it took around half a day to get used to the handling needed for managing the setup.

The Images.

A strength, however, is obviously how the lens renders its own characteristics and coupled with Fujifilm’s beautiful film simulations, one then really obtains a set of images unique and in their own class.

The lens renders with a lovely character, even with a cropped sensor, very sharp at f2 and with bokeh (in my opinion) more tending towards the ‘busy’ side at times. However ‘sharp’ as they are, a personal take is this setup will not as as ‘sharp’ as output from Fujifilm’s own native lenses. 

It is obviously not a setup that I will plan to bring for a horse-racing competition but yet the one set-up I will want to reach for when I have this once in a while itch to simply go out, have fun, enjoy the world and photograph what I enjoy seeing. 

The little moments we know when we simply want to enjoy photography for what it is.

And as always to the naysayers who say this will never be fast enough for anything moving, my answer will simply be: if I can capture children in their erratic way of playing and fooling around, the problem with the ones whining is likely in how they use their cameras than the equipment itself. 

Maybe I might get an M camera one day to allow me to take full advantage of this little beauty of a lens, but for now, I am pretty happy to enjoy using it on the X-Pro3 for a while longer. 

*the lady in the photos with the Fujifilm X-T3 is Nathalie, a dear friend who is a Fujifilm fangirl. Her IG is at @sodiumion

Thank you for reading. 


6 Replies to “Adapting the 47 years old Leica 35mm Summicron Ver III on the Fujifilm X-Pro3 – a visual review”

    1. Hi, I’m planning to take some time later to catch up on your writings too 🙂 when mounting the 35 Summicron onto X-mount, yes, the focal length is around 53mm as you mentioned , however depth of field wise we do lose one stop (approximately) but the light gathering abilities are still the same at F2. This is what I know and was taught but then I may be incorrect too.


      1. There is all kinds of compliacted math to prove either side. What I have relied on to settle the issue for me is to compare images taken with an iPhone and images taken with my Fujifilm X-T2 at the same equivalent focal lengh.

        The “telephoto” camera on the back of the iPhone 11 Pro is a 6mm f/2.0 lens which is 51mm focal length in 35mm FF format. When I compare the DOF of the resulting images against the DOF of 34mm focal length (~51mm in 35mm FF terms) on the X, I can clearly see that the iPhone images have way more DOF.


  1. A M-mount adapter with a RF-coupling mechanism that actually transmits the focus distance to the camera would be great. Then one could use the OVF frame and parallax indicator properly with Leica (and other M-mount) lenses.

    Liked by 1 person

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