Voigtländer Ultron 35mm f/1.7 Leica Thread Mount Lens Review

Voigtländer Ultron 35mm f/1.7

Voigtländer Ultron 35mm f/1.7 Leica Thread Mount Lens Review

3000 1688 Chris Cushing

My foray into the world of Voigtländer started off as a lark, and I can blame this Voigtländer Ultron 35mm f/1.7 LTM lens for that. I wanted a 35mm lens to use on my Canon P and Fuji X cameras, and snapped up this Ultron and the Bessa R that came with it on eBay. Based on their reputation, I knew that Bessas had excellent viewfinders but suffered from primarily-plastic construction. I figured I’d pump a few rolls through this mediocre camera, put it on the shelf, and use the lens on my trusty all-metal Canon. 

But since I bought the Bessa, I’ve not shot my Canon P once. When James sent me a Leica M-A to review, I stuck this lens on it. When I vacationed across the Atlantic, I brought just the Bessa and three lenses. This 35mm was virtually welded to the camera for the duration of the trip. 

So much for a lark. This may have turned into a way of life.

I’m not usually one for 35mm lenses, and I’ve only owned a handful of fixed 35s. I tend to prefer longer lenses, sometimes opting for long telephotos where others would use a 50mm. Where long lenses aren’t permissible, I tend to wind up on either side of 35mm, choosing instead either a 28mm or a 40mm. But shooting these focal lengths isn’t as simple with rangefinders as it is with an SLR. Apart from a handful of M-Mount Voigtländers, there aren’t many affordable interchangeable lens rangefinders with 28mm and  40mm framelines (Minolta’s CLE being one of the few that spring to mind, though that’s not so affordable these days).

If I was willing to compromise a bit, I’d have many more bodies to choose from. But as my affection for rangefinder shooting grows, I’ve had to adapt my lens preferences. 

Voigtländer Ultron 35mm f/1.7

Lens Construction and Build Quality

The Ultron itself is a puzzling lens, and like many Voigtländer products it offers some superlative specifications. If you want to play in Leica’s league, you need to at least make some headlines. The lens is emblazoned with “Aspeherical” across its snout. It features all-metal construction and a concave front element. It’s metal aperture ring snaps across half-stop clicks all the way from f/1.7 to f/16 (and feels great doing so). It’s even got a slickly integrated lens hood. 

The Voigtländer Ultron 35mm f/1.7 brings optics that are slightly unusual, specifically incorporating two peculiar items. The rearmost element is aspherical, designed to improve corner-to-corner sharpness and reduce distortion. The front element is concave, and while the inclusion of concave elements in lens construction is not that unusual, it is a bit atypical to see this in the front element (early Canon FD mount 35mm f/2s shared this quirk). 

The overall optical scheme incorporates eight elements in six groups, with modern multi-coated glass. The maximum aperture of f/1.7 is relatively fast for a 35mm lens, and was designed specifically to one-up the f/2 Leica Summicron. The Ultron, in fact, is one of the fastest 35mm lens ever made in Leica Thread Mount (second only to Canon’s 35/1.5). Even the name seems designed to win a game of top-trumps.

Voigtländer lenses and their early 35mm Bessa cameras couldn’t be more different, and it can be hard to accept that they come from the same company. Where the Bessa R feels like a product of the 1990s with its judicious application of plastics, the lenses feel rather more special. The Ultron feels like my vintage Super-Takumars, rather than a lens made on the cusp of Y2K. 

But despite how different they are to the touch, the Bessa R and the Ultron complement each other perfectly. The black finish on the lens matches the semi-gloss black plastic beautifully. Taken as a whole, the package looks incredibly cohesive. It does funny things to the brain. 

These matching finishes only hint at the effort Voigtländer exerted in making the Voigtländer Ultron 35mm f/1.7 and Bessa R a cohesive pair. As I said in my review of the body, when combined the lens and camera feel like a great fixed-lens rangefinder rather than a body with a lens attached. The Ultron’s short focus throw and the Bessa’s crisp viewfinder go together like Chuck Taylors and Sharpie. 

Image Quality and Sample Shots

Of course there’s a catch, and the Voigtländer Ultron 35mm f/1.7 simply wouldn’t be a Voigtländer without a “but.” In practice, despite the special construction and aspherical element, the Ultron is just not that sharp. Especially when shot wide open the Ultron simply doesn’t deliver the crispest, razor-to-the-retina images many shooters seem to crave.

Stop down even a little and this issue goes away almost entirely. Of course, once you’ve twisted that aperture ring even the slightest bit away from f/1.7 and you’re at f/2. The “it’s faster than a Summicron” argument suddenly falls on its face. If you don’t mind that and you continue spinning that ring, you’ll find a lens that when stopped down beyond f/2 or f/2.5 suddenly makes images that pop. At smaller apertures this lens really comes alive.

In most situations I didn’t find the relative lack of sharpness off-putting, and only in a few situations with multiple areas of back-lighting did it really foul up my images. If you’re willing to couple speed with some quirky character, then this lens offers a worthwhile compromise.

Color rendition is excellent, especially when coupled with Kodak Portra. Nearly every color shot in this review was shot on the stuff. When stopped down even slightly, sharpness is excellent, and the only way to make the thing misbehave is to point it at the sun and dare it to flare. 

Value Proposition

Despite its flaws, the Voigtländer Ultron remains a very compelling option. Its combination of build quality, color rendition, and sharpness at most apertures makes it a solid performer and a user-friendly lens. When considering its wallet-friendly price, it becomes even more interesting. Where all but the crustiest examples of Leica’s Summicron price higher than the four-figure mark, a perfect LTM Ultron can generally be purchased for under $500, and the revised M-Mount Ultrons sell for about $800 used.

Would I recommend the Ultron over a Summicron? Probably not, if someone else is footing the bill. For my money though, the humble Voigtländers are tough to beat. 

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Chris Cushing

Chris Cushing is a freelance writer, pedant and photographer who still plays with cars. Based in Albany, New York, he can often be seen aimlessly wandering the Northeast with a camera twice his age slung around his neck.

All stories by:Chris Cushing
  • R.E. the 3rd paragraph: “The Ultron, in fact, is the fastest 35mm lens ever made in Leica Thread Mount.” I believe Canon made a 35mm F/1.5, which Cameraquest lists as the fastest 35mm in LTM: https://cameraquest.com/ltmlens.htm . I enjoyed your review however, although I’m not sure why anyone would choose this over Voigtlander’s own 35mm F2.5. To be honest I have a hard time justifying these interchangeable-lens-rangefinders at all when you consider how cheap fixed-lens rangefinders are with faster than F/2 lenses. It’s the main reason I sold my Canon-P, it cost over 3 times as much as my Olympus 35SPN and the Jupiter-12 I used with it (which alone cost more than my Oly) was over a stop slower.

  • Nice review
    I think you should consider the Zeiss 35mm lenses (f2 and f2.8),the incredible ZM 35 1.4 and the Leica Summarit 35 2.4/5 before jumping to the Summicron.
    An interesting addition is the 7Artisans 35mm lens for about $350.


  • another 35mm to look into if you are shooting Leica M mount is the Leica summaron 2.8 although the non goggled ones go for too much now. and the goggle ones only work on Leica cameras but its an amazing lens. also reminds me of something a reporter in Vietnam in the mid 60s would have used. I got my goggled one for 500$ it blows my socks of in sharpness. vignetting is a little on the high side wide open. also the goggles help me. I have a hard time seeing the 35mm frame. the goggles put it in the 50mm frame witch helps a bunch. also like another comment the 35 f2.5 is really hard to beat in terms of price, image quality and size.

  • I think that it is worth noting that the updated M mount ultron is an amazing lens that outperforms all pre-asph summicrons and is on par with the asph summiluxes, albeit it lacks in color consistency. The LTM vs M ultrons are completely different beasts in my opinion.

  • This is a great review.
    Voigtlander/Cosina is a great brand. I love their products.
    By the way since it is made in a country like Japan, Germany, US, France, … countries which have human values and have a system of freedom, from other places, also if they will be awesome at 10$, I will not buy.
    This review is very useful.

  • Great review. I have this Ultron 35mm f/1.7 LTM literally glued to my M8 and perhaps the most versatile 35mm lens I have owned. it is actually quite sharp wide open which I generally use for close shots and bokeh.. Beautiful well-defined sunstars starting from f2 too. Absolutely true to the above “when stopped down beyond f/2 or f/2.5 suddenly makes images that pop. At smaller apertures this lens really comes alive.” – thought im still wonder why you wrote the lens is not as sharp. Perhaps you had a bad copy?

  • Charles Trentelman December 3, 2022 at 1:54 am

    i just did a test with mine because some scans of recent shots at f2 came out disturbingly unsharp. Sure enough — on a tripod at f 1.7and f 2 it is soft even at a 1/60 on a tripod. Sharpness increases markedly at 4.5 and 5.6, which is what yo get with almost all lenses.

    too bad — i bought this specifically for low light.

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Chris Cushing

Chris Cushing is a freelance writer, pedant and photographer who still plays with cars. Based in Albany, New York, he can often be seen aimlessly wandering the Northeast with a camera twice his age slung around his neck.

All stories by:Chris Cushing