Oskar Ojala , Apr 26, 2009; 05:11 a.m.
I thought I'd post some impressions of the Voigtländer 20/3.5, given that it's new and there aren't so many reviews yet available. In order for this not to turn into a one man show, I'll keep it brief. I tried this lens on my Nikon D300, but hope to get the chance to try it on FX.
Mechanics: This is a *very* small lens, best comparable with some slow 50 mm lenses. The mechanics are very good, the focusing is smooth and has a nice slightly soft rubber ring that protrudes and the aperture adjustment is smooth. No complaints here. Focuses to 0.2 m (about 8"). The focus scale seems to be reasonably accurate, so zone focusing can actually be used. Filter size is 52 mm, fitting in nicely with older MF lenses.
Sharpness&resolution: Good in center, a bit worse in corners. Clearly performs best when stopped down slightly. Doesn't have the crispness of a normal lens, but then this lens is quite wide and compared to other wide angles it performs well.
Vignetting: little at f3.5, none when stopped down. It's a full frame lens and it shows. Vignetting on FX is much more obvious, but I will still have to do test shots with a FX camera.
Distortion: a clear barrel distortion, but fixable in post processing. Nothing unexpected for a 20 mm lens (although I miss shooting with biogons which had no distortion...)
Bokeh: can exhibit some double lines, but most of the time my shots have looked good. I probably need to try this aspect in a bit more detail. The aperture is fairly round, though, which comes in handy.
Flare&ghosting: excellent. I got some ghosts when shooting into backlit scenes with a filter on, but none without filter, so it's clear that a filter may in some circumstances interact badly with the lens. But other than that I haven't seen any flare or ghosting problems and I've done quite many backlit shots.
Fringing&CA: haven't seen it, although I shoot with CA removal on. Still, looks quite promising in this area. I would need to test this more strictly, though.
Infrared: Extreme edges are not completely sharp, but still the performance is pretty good for a wide angle. Unsurprisingly, visible light and IR do not focus at the same spot, but the focus compensation is not so large.
Conclusion: A nice, hih quality, small manual focus lens that takes nearly no space in the bag. Good for shooting stopped down if corners need to be sharp. Performance when shooting against the light is great. The alternatives are mainly the Zeiss 21/2.8 (three times the size, three times the price), the Nikkor 14-24/2.8 (big, expensive and takes no filters) and some old or new Nikkor 20 mm lens. Only the older Nikkor 20 mm are really apple to apple comparisons in terms of price and size and I haven't used them.
Oskar Ojala , Apr 26, 2009; 05:12 a.m.
A second sample illustrating against the light shooting (and also some distortion)
The sun is just above the frame, yet the image is contrasty and no ghosts can be seen
Tommy Lee , Apr 26, 2009; 11:17 a.m.
Thanks. I have their 70/2.5 and 125 macro and really like it . How is the Voigtlander 20 compared to say one of Nikon's better 1x-xx zoom (ie: 16-85 or 18-70) at 20 on a D300?
Oskar Ojala , Apr 26, 2009; 01:23 p.m.
Well I sold my 18-70 last year since I felt that the quality wasn't good enough on my D300 and wanted to force myself to use primes if necessary (and needed money for new lenses), so I can't compare directly. I have a friend who might have a kit zoom, but in any case wouldn't get to try that in at least a week anyway. And not planning to buy more DX lenses.
Excuses aside, I can try to compare it based on my long experience with the 18-70. The 18-70 will vignette much more, it has somewhat more obvious distortion (now I hope photozone won't prove me wrong here...) and it is much more prone to flare, ghosting and CA. A resolution comparison is too difficult, but the Voigtländer is for sure not worse.
I'll probably get to try the Voigländer on a D700 tomorrow...let's see...
Joe Walsh 
, Apr 26, 2009; 04:50 p.m.
Thanks for the report, Oskar. You're right, not much information yet.
I have the 14-24 2.8 but am still interested in getting this 20mm for my D700. For example, I'm thinking of crashing waves, blowing sand with the lens low and close---time for a UV filter!
Curious to see what you find out tomorrow.
Tito Espina , Apr 26, 2009; 09:08 p.m.
So, where can you buy this lens and how much is the currrent price?
Oskar Ojala , Apr 27, 2009; 03:21 p.m.
Tried it a bit on a D700 and compared with a Zeiss 18/3.5, courtesy of Ilkka Nissilä. The D700 pics were left to him (we didn't have a computer with us), but he reported that the center was sharp at f4 but the corners soft, while at f8 corners were good. So my take is that if you plan to shoot stopped down and want very good (but not the ultimate) quality then the Voigtländer is a good choice. My assumption is that especially at larger apertures and on the edges, the Zeiss 21/2.8 would be the king, but I haven't tried it.
I will note though that it is hard to describe the physical impression of the 20/3.5 in words. First, it's small, very small. Second, the mechanics are very nice; the focusing is just right and there's no slack to be found anywhere on the lens. Some people might not care about this, but it's a pretty nice aspect :-)
As for buying, I bought from http://www.fotomundus24.de/shop/ which had it in stock and delivered promptly (they have their own section for Voigtländer). http://robertwhite.co.uk/ also carries it as does http://www.cameraquest.com/ in the US. Voigtländer also has a list of distributors on their site. I paid 409 euros + shipping, which I consider an entirely reasonable price for this lens.
Harvey Edelstein , Apr 27, 2009; 08:31 p.m.
Was the Zeiss that much better to justify the differential in price? And could you compare those two lenses since I have not seen them comparred anywhere.
Ilkka Nissila 
, Apr 28, 2009; 06:29 a.m.
Unfortunately I managed to misfocus the Zeiss sufficiently that it's it's best to do a reshoot before drawing final conclusions about image quality. The Zeiss seemed to better resist flare at high-contrast edges and maintain sharpness to the edges at f/4; but by f/8 it seemed there wasn't any significant difference in image quality.
I was impressed by the handling and size of the Voigtländer. If I were buying a superwide again, I would probably choose it over the Zeiss offerings due to the difference in price and size. If wide aperture performance is a top priority, and size and price are not, then probably it's better to get the 21mm ZF or the 14-24/2.8 Nikkor.
Ramon V (California) , Apr 28, 2009; 10:21 a.m.
other than boasting of its german technology (and maybe price), i find nothing fantastic in the voigtlander 20mm f/3.5. i'd go for the nikkor 12-24mm. maybe more money, but at least you get the versatility of a zoom. but then again, each one has his own preference.
and the bottom line is we like trying out stuff and have fun experimenting with them. that's the beauty of this hobby.
