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Cons: The lens has noticeable longitudinal chromatic aberration wide-open, much improved by F2.8 and gone by F4.0, hence I would not recommend it for high resolution digital photography. The lens is objectively softer at F2 than F2.8, but it is irrelevant for 35mm film photography.

Pros: The lens is exceptionally compact and well built (all metal). For film photography, the image quality is much better than the tests suggest. Even at F2, the image is pretty sharp, unless you like pixel peeping.

Summary: Its compactness makes it a perfect companion for 35 mm cameras such as the Nikon FM3A and similar. A very interesting combo for street or travel photography. Enough image quality across full aperture range. Worth considering vs. 35 & 50 mm alternatives.

Cons: unpractical lens cap, some flare

Pros: Excellent build quality, fast, compact, sharp wide open, good image quality, fair pricing, accessories

Summary: It's remarkable that nobody has reviewed this lens here yet as one would assume that with its all metal build, excellent overall image quality and compact size it would particularly appeal to Pentax users. The Ultron's physical length doesn't exceed that of the Pentax DA 21mm and 70mm Limited pancakes and also the build quality is easily on par with that of Pentax' counterparts. Manual focus on this lens is easily the best and most enjoyable I have operated to date, the focus ring being very well damped and rubberized with a focus throw that is just about perfect. The lens comes with a tiny, thoughtfully designed lens hood, a close-up filter and a snap-on lens cap. The latter is the only minor design flaw: it is made of plastic and only fits on the lens hood. Due to its small size (33mm, I think) it is sometimes awkward to use. Overall the Ultron SLII feels very substantial and balances well on my K-m. Image quality is generally very good. Colour reproduction, sharpness and contrast seem excellent to me and while I do not perfrom any formal tests with my lenses, I cannot complain about chromatic aberration, vignetting or distortion. My pictures generally turn out very well with this lens. Notably, it is already sharp at its biggest aperture of F/2, which allows for some interesting possibilities in low light. While the bokeh is not outstanding, it commonly looks good to me. I have also seen examples where it could have been a bit more pleasant, but overall you'd have to be very critical to seriously call it problematic, I'd say. Anyway, depth of field is more than shallow enough for creative use without making manual focussing too difficult. I bought the Voigtländer Ultron to complement my setup with a fast, compact lens for travelling and while I thought I preferred normal to wide focal ranges, it has quickly grown on me with its 40mm, i. e. long-normal, focal length. It is a very versatile lens and a great option for street and night photography. Anyone interested in the incredibly popular Pentax DA 40mm Limited lens should seriously consider the Ultron SLII as an alternative. It is hardly any bigger than the DA but a whole stop faster and provides plenty of value for a fair price. Realtor Marketing Guide | printing services

Cons: None, being aware stopping down always helps

Pros: Sharp from f/3.2, incredibly contrasty, no CA to see, and love the colour! In addition, it is small, great for just taking along, and is certainly the most inconspicuous lens for streetshooting. Did I mention great quality construction?

Summary: This lens seems to have it all, except for autofocus - and that is a plus for slowing down and better composing the image. I have a Nikon 70-200 2.8 VRII when I need to cover action, but for "taking to work" and just fun photography, this little pancake 40 f/2 is on the camera.

Cons: None Noted.

Pros: Excellent sharpness, build, contrast & colors.

Summary: Great glass and metal build.

Cons: Rubber focus ring came loose (although the rubber ring was replaced under warranty without question).

Pros: Tiny size allows it to be kept on the camera all the time. Fast(ish) for such a small lens Awesome quality (aside from the rubber ring mentioned above) Wonderful punchy sharp images

Summary: If you dont mind manual focus, this is the perfect single lens for full frame SLR's.

Cons: None.

Pros: Lovely bokeh. Remarkably sharp. Superb colour rendition. Light weight. Very smooth focus. Extremely accurate focus (on Nikon D700). Well constructed.

Summary: Zeiss quality at 1/3 the price.

Cons: little soft at f/2 , but thats not really a problem

Pros: Sharp all over from f 3.2 , beautiful contrast !, very nice to handle, no AF is fine , lightweight, low price for the quality. 40 mm is a very useful focal length on full frame.

Summary: Super satisfying lens, going to buy the 58 mm NOKTON also.